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    List of Diseases

    Aberrant basal cell carcinoma
    Abietic acid dermatitis
    Acanthoma fissuratum (granuloma fissuratum, spectacle frame acanthoma)
    Accessory nail of the fifth toe
    Accessory tragus (ear tag, preauricular appendage, preauricular tag)
    Acid-induced
    Acne aestivalis (Mallorca acne)
    Acne conglobata
    Acne cosmetica (cosmetic acne)
    Acne fulminans (acute febrile ulcerative acne)
    Acne keloidalis nuchae (acne keloidalis, dermatitis papillaris capillitii, folliculitis keloidalis, folliculitis keloidis nuchae, nuchal keloid acne)
    Acne mechanica
    Acne medicamentosa
    Acne miliaris necrotica (acne varioliformis)
    Acne necrotica
    Acne vulgaris
    Acne vulgaris (acne simplex)
    Acne with facial edema (solid facial edema)[nb 4]
    Acquired generalized hypertrichosis (acquired hypertrichosis lanuginosa, hypertrichosis lanuginosa acquisita)
    Acquired generalized lipodystrophy (Lawrence syndrome, Lawrence–Seip syndrome)
    Acquired perforating dermatosis (acquired perforating collagenosis)
    Acquired progressive lymphangioma (benign lymphangioendothelioma)
    Acral arteriolar ectasia
    Acral fibrokeratoma (acquired digital fibrokeratoma, acquired periungual fibrokeratoma)
    Acral nevus (melanocytic nevus of acral skin, melanocytic nevus with intraepidermal ascent of cells)
    Acral persistent papular mucinosis
    Acrochordon (cutaneous papilloma, cutaneous tag, fibroepithelial polyp, fibroma molluscum, fibroma pendulum, papilloma colli, skin tag, soft fibroma, Templeton skin tag)
    Acrodermatitis chronica atrophicans (Herxheimer disease, primary diffuse atrophy)
    Acrodermatitis enteropathica
    Acrodynia (calomel disease, erythredemic polyneuropathy, pink disease)
    Acrogeria (Gottron syndrome)
    Acrokeratosis paraneoplastica of Bazex (acrokeratosis neoplastica, Bazex syndrome)
    Acrokeratosis verruciformis (acrokeratosis verruciformis of Hopf)
    Acroosteolysis
    Acrospiroma (clear cell hidradenoma, dermal duct tumor, hidroacanthoma simplex, nodular hidradenoma, poroma)
    Acrylic monomer dermatitis
    Actinic elastosis (solar elastosis)
    Actinic keratosis (senile keratosis, solar keratosis)
    Acute biphenotypic leukemia
    Acute cutaneous lupus erythematosus
    Acute eosinophilic leukemia
    Acute generalized exanthematous pustulosis
    Acute generalized exanthematous pustulosis (pustular drug eruption, toxic pustuloderma)
    Acute lymphoblastic leukemia
    Acute myeloid dendritic cell leukemia
    Acute myeloid leukemia
    Acute paronychia
    Adams–Oliver syndrome
    Adducted thumbs syndrome
    Adenoid squamous cell carcinoma (pseudoglandular squamous cell carcinoma)
    Adenoma sebaceum
    Adhesive dermatitis
    Adiposis dolorosa (Dercum's disease)
    Adrenocortical carcinoma
    Adult chest and abdomen with many red skin lesions
    Adult forehead with scattered red pimples
    Adult linear IgA disease
    Adult male with a large, red, bulbous nose
    Adult type of generalized eruption of cutaneous mastocytosis
    Adverse reaction to biologic agents
    Adverse reaction to cytokines
    Aeromonas infection
    African blackwood dermatitis
    African cutaneous Kaposi sarcoma
    African lymphadenopathic Kaposi sarcoma
    African tick bite fever
    Aggressive digital papillary adenocarcinoma (digital papillary adenocarcinoma, papillary adenoma)
    Aggressive infantile fibromatosis
    AIDS-associated Kaposi sarcoma
    AIDS-related cancers
    AIDS-related lymphoma
    Ainhum (bankokerend, dactylolysis spontanea, sukhapakla)
    Airbag dermatitis (airbag burn)
    Albright's hereditary osteodystrophy
    Alkali-induced
    Allergic
    Allopurinol hypersensitivity syndrome
    Alopecia areata
    Alopecia areata
    Alopecia neoplastica
    Alpha-1 antitrypsin deficiency panniculitis (alpha1-protease deficiency panniculitis, alpha1-proteinase deficiency panniculitis)
    Alphavirus infection
    Amelanotic blue nevus (hypomelanotic blue nevus)
    American tick bite fever (Rickettsia parkeri infection)
    Amniotic band syndrome (ADAM complex, amniotic band sequence, congenital constriction bands, pseudoainhum)
    Anagen effluvium
    Anal cancer
    Anaplastic large cell lymphoma
    Androgenic alopecia (androgenetic alopecia)
    Anetoderma (anetoderma maculosa, anetoderma maculosa cutis, atrophia maculosa cutis, macular atrophy)
    Angelman syndrome
    Angiofibroma
    Angioimmunoblastic T-cell lymphoma
    Angiokeratoma
    Angiokeratoma of Fordyce
    Angiokeratoma of Fordyce (angiokeratoma of the scrotum and vulva)
    Angiokeratoma of Mibelli (Mibelli's angiokeratoma, telangiectatic warts)
    Angioleiomyoma (vascular leiomyoma)
    Angiolipoleiomyoma
    Angiolipoma
    Angiolymphoid hyperplasia with eosinophilia (epithelioid hemangioma, histiocytoid hemangioma, inflammatory angiomatous nodule, inflammatory arteriovenous hemangioma, intravenous atypical vascular proliferation, papular angioplasia, pseudopyogenic granuloma)
    Angioma serpiginosum
    Angiosarcoma
    Anhidrosis (hypohidrosis)
    Annular erythema of infancy
    Anonychia
    Anticoagulant-induced skin necrosis
    Anticonvulsant hypersensitivity syndrome
    Antifungal agent-induced
    Antimicrobial agent-induced
    Apert syndrome (acrocephalosyndactyly)
    Aplasia cutis congenita (cutis aplasia, congenital absence of skin, congenital scars)
    Apocrine gland carcinoma
    Apocrine nevus
    Aponeurotic fibroma (calcifying aponeurotic fibroma, juvenile aponeurotic fibroma)
    Apparent leukonychia
    Appendix cancer
    Arcanobacterium haemolyticum infection
    Arsenic dermatitis
    Arsenical keratosis
    Arteriovenous fistula
    Arthrogryposis–renal dysfunction–cholestasis syndrome
    Arthropod assault
    Artificial nail-induced
    Astrocytoma
    Asymmetric periflexural exanthem of childhood (unilateral laterothoracic exanthem)
    Ataxia telangiectasia (Louis–Bar syndrome)
    Atrichia with papular lesions (papular atrichia)
    Atrophic actinic keratosis
    Atrophic connective tissue panniculitis
    Atrophoderma of Pasini and Pierini (dyschromic and atrophic variation of scleroderma, morphea plana atrophica, sclérodermie atrophique d'emblée)
    Atrophodermia vermiculata (acne vermoulante, acne vermoulanti, atrophoderma reticulata symmetrica faciei, atrophoderma reticulatum, atrophoderma vermiculata, atrophoderma vermiculatum, atrophodermia reticulata symmetrica faciei, atrophodermia ulerythematosa, atrophodermie vermiculée des joues avec kératoses folliculaires, folliculitis ulerythema reticulata, folliculitis ulerythematous reticulata, folliculitis ulerythemosa, honeycomb atrophy, ulerythema acneforme, ulerythema acneiforme)
    Atypical fibroxanthoma
    Atypical lichen myxedematosus (intermediate lichen myxedematosus)
    Atypical tuberous myxedema (Jadassohn–Dosseker syndrome)
    Autoimmune estrogen dermatitis
    Autoimmune polyendocrinopathy–candidiasis–ectodermal dystrophy syndrome
    Autoimmune progesterone dermatitis
    Autosensitization dermatitis
    Axillary antiperspirant-induced
    Axillary deodorant-induced
    B virus infection
    B-cell prolymphocytic leukemia
    Baboon syndrome
    Bacillary angiomatosis
    Balanitis plasmacellularis (balanoposthitis chronica circumscripta plasmacellularis, balanitis circumscripta plasmacellularis, plasma cell balanitis, plasma cell vulvitis, vulvitis circumscripta plasmacellularis, Zoon's balanitis, Zoon's erythroplasia, Zoon's vulvitis)
    Balloon cell nevus
    Bannayan–Riley–Ruvalcaba syndrome
    Barraquer–Simons syndrome (acquired partial lipodystrophy, cephalothoracic lipodystrophy, progressive lipodystrophy)
    Bart syndrome
    Basal cell carcinoma
    Basal cell carcinoma
    Basal-cell carcinoma
    Basaloid follicular hamartoma
    Basaloid squamous cell carcinoma
    Bazex–Dupré–Christol syndrome (Bazex syndrome, follicular atrophoderma and basal cell cacinomas)
    Beare–Stevenson cutis gyrata syndrome
    Beau's lines
    Becker's nevus
    Becker's nevus (Becker's melanosis, Becker's pigmentary hamartoma, nevoid melanosis, pigmented hairy epidermal nevus)
    Bejel (endemic syphilis)
    Benign lipoblastomatosis (embryonic lipoma)
    Benign melanocytic nevus (banal nevus, common acquired melanocytic nevus, mole, nevocellular nevus, nevocytic nevus)
    Benign neonatal hemangiomatosis
    Benign symmetric lipomatosis (benign symmetric lipomatosis of Launois–Bensaude, Madelung's disease)
    Big toe with most of the toenail missing; only the nail's root is present
    Birt–Hogg–Dubé syndrome
    Black dermatographism
    Bladder cancer
    Blastomycosis-like pyoderma (pyoderma vegetans)
    Blau syndrome
    Blau syndrome
    Bleaching cream-induced
    Blepharochalasis
    Blepharophyma
    Blistering distal dactylitis
    Blisters distributed over an adult forearm
    Bloom syndrome (Bloom–Torre–Machacek syndrome)
    Blue nails
    Blue nevus (blue neuronevus, dermal melanocytoma, nevus bleu)
    Blue nevus of Jadassohn–Tièche (common blue nevus, nevus ceruleus)
    Blue rubber bleb nevus syndrome
    Boston exanthem disease
    Botryomycosis
    Bovine papular stomatitis
    Bowen's disease
    Bowen's disease (squamous cell carcinoma in situ)
    Bowenoid papulosis
    Brainstem glioma
    Branchial cyst (branchial cleft cyst)
    Breast cancer
    Breast eczema (nipple eczema)
    Brill–Zinsser disease
    Brittle hair–intellectual impairment–decreased fertility–short stature syndrome
    Bromidrosis (apocrine bromhidrosis, fetid sweat, malodorous sweating, osmidrosis)
    Bromoderma
    Bronchial adenomas/carcinoids
    Bronchogenic cyst
    Brooke–Fordyce syndrome
    Brucellosis (Bang's disease, Malta fever, undulant fever)
    Bubble hair deformity
    Bubonic plague
    Buffalopox
    Bullous drug reaction (bullous drug eruption, generalized bullous fixed drug eruption, multilocular bullous fixed drug eruption)
    Bullous impetigo
    Bullous lupus erythematosus
    Bullous pemphigoid
    Burkitt's lymphoma
    Buschke–Ollendorff syndrome (dermatofibrosis lenticularis disseminata)
    Butcher's wart
    Calcinosis–Raynaud phenomenon–esophageal dysmotility–sclerodactyly–telangiectasia syndrome (CREST syndrome)
    CantĂş syndrome
    Capillary aneurysms
    Capillary hemangioma (infantile hemangioma, nevus maternus, strawberry hemangioma, strawberry nevus)
    Capsaisin-induced
    Carcinoid
    Carcinoid tumor, gastrointestinal
    Cardio-facio-cutaneous syndrome (cardiofaciocutaneous syndrome)
    Carney complex (LAMB syndrome, NAME syndrome)
    Cartilage–hair hypoplasia (McKusick type metaphyseal chondrodysplasia)
    Cat scratch disease (cat scratch fever, English–Wear infection, inoculation lymphoreticulosis, subacute regional lymphadenitis)
    Cavernous venous malformation
    Cellular blue nevus
    Cellulitis
    Cellulitis
    Central centrifugal cicatricial alopecia (follicular degeneration syndrome, pseudopelade of the central scalp)
    Centrifugal abdominal lipodystrophy (centrifugal lipodystrophy, lipodystrophia centrifugalis abdominalis infantalis)
    Centrofacial lentiginosis
    Cerebellar astrocytoma
    Cerebral astrocytoma
    Cerebral dysgenesis–neuropathy–ichthyosis–keratoderma syndrome
    Ceruminoma
    Cervical cancer
    Chancre
    Chancroid (soft chancre, ulcus molle)
    Chemical burn
    Chemical burn
    Chemotherapy-induced acral erythema (palmoplantar erythrodysesthesia syndrome)
    Chemotherapy-induced hyperpigmentation
    Cherry angioma (De Morgan spot, senile angioma)
    Chevron nail (herringbone nail)
    Chikungunya fever
    Chilblain lupus erythematosus (chilblain lupus erythematosus of Hutchinson)
    Childhood dermatomyositis
    Childhood discoid lupus erythematosus
    Childhood linear IgA disease (chronic bullous disease of childhood)
    Childhood systemic lupus erythematosus
    Childhood tumor syndrome
    Chlamydial infection
    Chloracne
    cholangiocarcinoma
    Chondrodermatitis nodularis chronica helicis
    Chondrodermatitis nodularis chronica helicis (chondrodermatitis nodularis helicis)
    Chondrodysplasia punctata
    Chondroid lipoma
    Chondrosarcoma
    Chordoma
    Chrome dermatitis
    Chromhidrosis (colored sweat)
    Chromobacteriosis infection
    Chronic erythema nodosum
    Chronic erythema nodosum (erythema nodosum migrans, subacute migratory panniculitis of Vilanova and Piñol, subacute nodular migratory panniculitis)
    Chronic infantile neurologic cutaneous and articular syndrome
    Chronic lymphangitis
    Chronic lymphocytic leukemia
    Chronic myelogenous leukemia
    Chronic paronychia
    Chronic recurrent erysipelas
    Chronic scar keratosis (chronic cicatrix keratosis)
    Chronic undermining burrowing ulcers (Meleney gangrene)
    Chronic vesiculobullous hand eczema
    Cicatricial alopecia
    Cicatricial basal cell carcinoma (morpheaform basal cell carcinoma, morphoeic basal cell carcinoma)
    Cicatricial junctional epidermolysis bullosa
    Cicatricial pemphigoid (benign mucosal pemphigoid, benign mucous membrane pemphigoid, ocular pemphigus, scarring pemphigoid)
    Ciliated cyst of the vulva (cutaneous MĂĽllerian cyst, paramesonephric mucinous cyst of the vulva)
    Circular coin-sized bare patch on the back of a person's scalp
    Circumostomy eczema
    Classic Kaposi sarcoma
    Clear cell acanthoma (acanthome cellules claires of Degos and Civatte, Degos acanthoma, pale cell acanthoma)
    Clear cell squamous cell carcinoma (clear cell carcinoma of the skin)
    Clonal seborrheic keratosis
    Close-up view of an adult eyelid on which there are numerous small, elevated skin lesions filled with white material
    Clothing-induced
    Clubbing (drumstick fingers, Hippocratic fingers, watch-glass nails)
    Cobalt dermatitis
    Cockayne syndrome
    Cold panniculitis (popsicle panniculitis)
    Collagenous fibroma (desmoplastic fibroblastoma)
    Colobomas of the eye–heart defects–ichthyosiform dermatosis–mental retardation–ear defects syndrome (CHIME syndrome, Zunich neuroectodermal syndrome, Zunich–Kaye syndrome)
    Colon cancer
    Common seborrheic keratosis (basal cell papilloma, solid seborrheic keratosis)
    Complement deficiency syndromes
    Composite hemangioendothelioma
    Condylomata acuminata
    Condylomata lata
    Congenital cartilaginous rest of the neck (cervical accessory tragus, wattle)
    Congenital erosive and vesicular dermatosis
    Congenital generalized lipodystrophy (Berardinelli–Seip syndrome)
    Congenital hemidysplasia with ichthyosiform erythroderma and limb defects syndrome (CHILD syndrome)
    Congenital hypertrophy of the lateral fold of the hallux
    Congenital lip pit (congenital sinus of the lower lip, lip sinus, midline sinus of the upper lip)
    Congenital malformations of the dermatoglyphs
    Congenital melanocytic nevus
    Congenital onychodysplasia of the index fingers
    Congenital rubella syndrome
    Congenital smooth muscle hamartoma
    Connective tissue nevus (collagenoma, elastoma, shagreen patch)
    Conradi–Hünermann syndrome (Conradi–Hünermann–Happle syndrome, Happle syndrome, X-linked dominant chondrodysplasia punctata)
    Contact stomatitis (contact lichenoid reaction, lichenoid amalgam reaction, oral mucosal cinnamon reaction)
    Contact urticaria
    Corticosteroid-induced
    Cosmetic dermatitis
    Cosmetic intolerance syndrome
    Costello syndrome
    Cowden syndrome (Cowden's disease, multiple hamartoma syndrome)
    Cowpox
    Craniosynostosis–anal anomalies–porokeratosis syndrome
    Cronkhite–Canada syndrome
    Crouzon syndrome
    Cutaneous actinomycosis
    Cutaneous anthrax infection
    Cutaneous C. diphtheriae infection (Barcoo rot, diphtheric desert sore, septic sore, Veldt sore)
    Cutaneous ciliated cyst
    Cutaneous columnar cyst
    Cutaneous endometriosis
    Cutaneous focal mucinosis
    Cutaneous group B streptococcal infection
    Cutaneous horn (Cornu cutaneum)
    Cutaneous lupus mucinosis (papular and nodular mucinosis in lupus erythematosus, papular and nodular mucinosis of Gold, papulonodular mucinosis in lupus erythematosus)
    Cutaneous meningioma (heterotopic meningeal tissue, rudimentary meningocele)
    Cutaneous myelofibrosis
    Cutaneous myxoma
    Cutaneous Pasteurella hemolytica infection
    Cutaneous Streptococcus iniae infection
    Cutaneous T-cell lymphoma
    Cutis laxa (chalazoderma, dermatochalasia, dermatolysis, dermatomegaly, generalized elastolysis, generalized elastorrhexis, pachydermatocele)
    Cutis marmorata telangiectatica congenita (congenital generalized phlebectasia, Van Lohuizen syndrome)
    Cutis rhomboidalis nuchae
    Cutis verticis gyrata
    Cystic basal cell carcinoma
    Cystic lymphatic malformation
    Cytomegalic inclusion disease
    Cytophagic histiocytic panniculitis
    Darier's disease (Darier–White disease, dyskeratosis follicularis, keratosis follicularis)
    Dark area of skin, reminiscent of a bruise, on the inner ankle of an adult
    Deep penetrating nevus
    Dengue (Break-bone fever)
    Dentifrice-induced
    Dermal dendrocyte hamartoma
    Dermal eccrine cylindroma (cylindroma)
    Dermatitis from metals and metal salts
    Dermatitis gangrenosa (gangrene of the skin)
    Dermatitis herpetiformis (Duhring disease)
    Dermatofibroma (benign fibrous histiocytoma, dermal dendrocytoma, fibrous dermatofibroma, fibrous histiocytoma, fibroma simplex, histiocytoma, nodular subepidermal fibrosis, sclerosing hemangioma)
    Dermatofibrosarcoma protuberans
    Dermatomyositis
    Dermatosis papulosa nigra
    Dermoid cyst
    DeSanctis–Cacchione syndrome
    Desmoid tumor
    Desmoplastic trichoepithelioma
    Diffuse cutaneous mastocytosis
    Diffuse infantile fibromatosis
    Diffuse large B-cell lymphoma
    Diffuse neonatal hemangiomatosis
    Dilated pore (dilated pore of Winer)
    Discrete papular lichen myxedematosus
    Disseminate and recurrent infundibulofolliculitis
    Disseminated herpes zoster
    Disseminated superficial actinic porokeratosis
    Disseminated superficial porokeratosis
    Dolichol kinase deficiency
    Dominant dystrophic epidermolysis bullosa
    Drug-induced acne
    Drug-induced angioedema
    Drug-induced lichenoid reaction (drug-induced lichen planus, lichenoid drug eruption)
    Drug-induced lipodystrophy
    Drug-induced lupus erythematosus
    Drug-induced nail changes
    Drug-induced pigmentation
    Drug-induced pseudolymphoma
    Drug-induced urticaria
    Drug-related gingival hyperplasia
    Dupuytren's contracture (Dupuytren's diathesis, Dupuytren's disease, palmar fibromatosis)
    Dust-induced
    Dyshidrosis (acute vesiculobullous hand eczema, cheiropompholyx, dyshidrotic eczema, pompholyx, podopompholyx)
    Dyskeratosis congenita (Zinsser–Cole–Engman syndrome)
    Dysplastic nevus (atypical mole, atypical nevus, B-K mole, Clark's nevus, dysplastic melanocytic nevus, nevus with architectural disorder)
    Dysplastic nevus syndrome (B-K mole syndrome, familial atypical multiple mole–melanoma syndrome, familial melanoma syndrome)
    Dystrophic epidermolysis bullosa
    Ear eczema
    Eccrine angiomatous hamartoma
    Eccrine carcinoma (syringoid carcinoma)
    Eccrine mucinosis
    Eccrine nevus
    Ecthyma
    Ecthyma gangrenosum
    Ectodermal dysplasia
    Ectodermal dysplasia with corkscrew hairs
    Ectrodactyly–ectodermal dysplasia–cleft syndrome (EEC syndrome, split hand–split foot–ectodermal dysplasia–cleft syndrome)
    Eczema herpeticum (Kaposi's varicelliform eruption)
    Eczema vaccinatum
    Eczema vaccinatum
    Ehlers–Danlos syndrome (cutis hyperelastica, elastic skin, India rubber skin)
    Ehrlichiosis ewingii infection
    Elastofibroma dorsi
    Elastosis perforans serpiginosa
    Elephantiasis nostras
    Encephalocele
    Endemic pemphigus (endemic pemphigus foliaceus, fogo selvagem)
    Endemic typhus (murine typhus)
    Endometrial cancer
    Endovascular papillary angioendothelioma (Dabska tumor, Dabska-type hemangioendothelioma, hobnail hemangioendothelioma, malignant endovascular papillary angioendothelioma, papillary intralymphatic angioendothelioma)
    Eosinophilia–myalgia syndrome
    Eosinophilic cellulitis (Wells' syndrome)
    Eosinophilic fasciitis (Shulman's syndrome)
    Eosinophilic granuloma
    Eosinophilic granulomatosis with polyangiitis (Churg–Strauss syndrome, allergic granulomatosis)
    Eosinophilic pustular folliculitis of infancy (eosinophilic pustular folliculitis in infancy, infantile eosinophilic pustular folliculitis, neonatal eosinophilic pustular folliculitis)
    Eosinophilic ulcer of the oral mucosa
    Eosinophilic ulcer of the oral mucosa (eosinophilic ulcer of the tongue, Riga–Fede disease, traumatic eosinophilic granuloma)
    Eosinophilic vasculitis
    Ependymoma
    Ephelis (freckle)
    Epidemic typhus (epidemic louse-borne typhus)
    Epidermal cyst (epidermal inclusion cyst, epidermoid cyst, infundibular cyst, keratin cyst)
    Epidermal nevus syndrome (Feuerstein and Mims syndrome, Solomon's syndrome)
    Epidermodysplasia verruciformis
    Epidermolysis bullosa acquisita
    Epidermolysis bullosa herpetiformis (Dowling–Meara epidermolysis bullosa simplex)
    Epidermolysis bullosa simplex
    Epidermolysis bullosa simplex of Ogna
    Epidermolysis bullosa simplex with mottled pigmentation
    Epidermolysis bullosa simplex with muscular dystrophy
    Epidermolytic acanthoma
    Epidermolytic hyperkeratosis (bullous congenital ichthyosiform erythroderma, bullous ichthyosiform erythroderma)
    Epithelioid blue nevus
    Epithelioid cell histiocytoma
    Epithelioid hemangioendothelioma
    Epithelioid sarcoma
    Epithelioma cuniculatum (Ackerman tumor, carcinoma cuniculatum)
    Epoxy resin dermatitis
    Erosive pustular dermatitis of the scalp (erosive pustular dermatosis of the scalp)
    Eruptive pseudoangiomatosis
    Eruptive vellus hair cyst
    Erysipelas
    Erysipelas (ignis sacer, Saint Anthony's fire)
    Erysipeloid of Rosenbach
    Erythema gyratum repens (Gammel's disease)
    Erythema infectiosum (fifth disease, slapped cheek disease)
    Erythema marginatum
    Erythema migrans (erythema chronicum migrans)
    Erythema multiforme
    Erythema multiforme major (erythema multiforme minor–erythema multiforme von Hebra)
    Erythema multiforme minor (herpes simplex-associated erythema multiforme)
    Erythema palmare
    Erythema toxicum neonatorum (erythema toxicum, toxic erythema of the newborn)
    Erythrasma
    Erythrodermic mastocytosis
    Erythrokeratodermia with ataxia (Giroux–Barbeau syndrome)
    Erythromelanosis follicularis faciei et colli
    Erythroplasia of Queyrat
    Erythrotelangiectatic rosacea (erythematotelangiectatic rosacea, vascular rosacea)
    Esophageal cancer
    Ethylenediamine-induced
    Ewing's sarcoma
    Exanthem of primary HIV infection (acute retroviral syndrome)
    Excessive scar tissue along an adult jawline
    Excoriated acne (acne excoriée des jeunes filles, Picker's acne)[nb 5]
    External otitis
    External otitis (otitis externa, swimmer's ear)
    Extragonadal germ cell tumor
    Extrahepatic bile duct cancer
    Extramammary Paget's disease
    Extraskeletal chondroma (chondroma of soft parts)
    Exudate over a background of redness on the external ear canal of an adult
    Exudative hyponychial dermatitis
    Eye makeup-induced
    Eyelid dermatitis
    Factitial panniculitis
    Familial benign chronic pemphigus (familial benign pemphigus, Hailey–Hailey disease)
    Familial cold urticaria (familial cold autoinflammatory syndrome)
    Familial Mediterranean fever
    Familial myxovascular fibromas
    Familial partial lipodystrophy (Köbberling–Dunnigan syndrome)
    Fanconi syndrome (familial pancytopenia, familial panmyelophthisis)
    Farmyard pox
    Fascial hernia
    Felon
    Fiberglass dermatitis
    Fibrodysplasia ossificans progressiva
    Fibroepithelioma
    Fibroepithelioma of Pinkus
    Fibrofolliculoma
    Fibroma of tendon sheath
    Fibromatosis colli (sternomastoid tumor of infancy)
    Fibrous hamartoma of infancy
    Fibrous papule of the nose (benign solitary fibrous papule, fibrous papule of the face)
    Fixed drug reaction
    Flea-borne spotted fever
    Flinders Island spotted fever
    Flower-induced
    Flying squirrel typhus
    Focal dermal hypoplasia (Goltz syndrome)
    Focal facial dermal dysplasia
    Folded skin with scarring (Michelin tire baby syndrome)
    Follicular atrophoderma
    Follicular hybrid cyst (Hybrid cyst)
    Follicular lymphoma
    Follicular mucinosis (alopecia mucinosa, mucinosis follicularis, Pinkus' follicular mucinosis, Pinkus' follicular mucinosis–benign primary form)
    Folliculitis
    Folliculitis decalvans
    Folliculitis nares perforans
    Folliculosebaceous cystic hamartoma
    Folliculosebaceous-apocrine hamartoma (follicular-apocrine hamartoma)
    Fordyce's spot
    Fordyce's spot (Fordyce's disease)
    Formaldehyde-induced
    Formaldehyde-releasing agent-induced
    Fournier gangrene (Fournier gangrene of the penis or scrotum)
    Fox–Fordyce disease
    Fragrance-induced
    Franceschetti–Klein syndrome (mandibulofacial dysostosis)
    Frontal fibrosing alopecia
    Frontal image of a child's face showing large hyperkeratotic papules and plaques with some induration suspicious for actinic keratoses and early squamous cell carcinomas
    Frontal linear scleroderma
    Frontal linear scleroderma (en coup de sabre, morphea en coup de sabre)
    Furunculosis (boil)
    Gallbladder cancer
    Ganglion cyst
    Ganglioneuroma
    Gardner's syndrome (familial colorectal polyposis)
    Gas gangrene (clostridial myonecrosis, myonecrosis)
    Gastric (stomach) cancer
    Gastrocutaneous syndrome
    Gastrointestinal carcinoid tumor
    Gastrointestinal stromal tumor (GIST)
    Generalized atrophic benign epidermolysis bullosa
    Generalized congenital hypertrichosis (congenital hypertrichosis lanuginosa)
    Generalized discoid lupus erythematosus
    Generalized epidermolysis bullosa simplex (Koebner variant of generalized epidermolysis bullosa simplex)
    Generalized eruptive keratoacanthoma (generalized eruptive keratoacanthoma of Grzybowski)
    Generalized erythema
    Generalized hyperhidrosis
    Generalized lentiginosis
    Generalized morphea
    Generalized trichoepithelioma
    Generalized vaccinia
    Genital herpes (herpes genitalis, herpes progenitalis)
    Genital leiomyoma (dartoic leiomyoma)
    Gestational trophoblastic tumor
    Gianotti–Crosti syndrome (infantile papular acrodermatitis, papular acrodermatitis of childhood, papulovesicular acrolocated syndrome)
    Giant axonal neuropathy with curly hair
    Giant cell fibroblastoma
    Giant cell tumor of the tendon sheath (giant cell synovioma, localized nodular tenosynovitis, pigmented villonodular synovitis)
    Giant condyloma acuminatum (Buschke–Löwenstein tumor, giant condyloma of Buschke–Löwenstein tumor)
    Giant pigmented nevus (bathing trunk nevus, congenital nevomelanocytic nevus, garment nevus, giant hairy nevus, nevus pigmentosus et pilosus)
    Giant solitary trichoepithelioma
    Gingival fibromatosis with hypertrichosis
    Glanders (equinia, farcy, malleus)
    Glandular rosacea
    Glioma
    Glomeruloid hemangioma
    Glomus tumor (glomangioma, solid glomus tumor, solitary glomus tumor)
    Gnathophyma
    Gold dermatitis
    Gonococcemia (arthritis–dermatosis syndrome, disseminated gonococcal infection)
    Gonorrhea (clap)
    Gouty panniculitis
    Graham-Little syndrome
    Gram-negative folliculitis
    Gram-negative rosacea
    Gram-negative toe web infection
    Granular cell tumor (Abrikossoff's tumor, Abrikossov's tumor, granular cell myoblastoma, granular cell nerve sheath tumor, granular cell schwannoma)
    Granuloma faciale
    Granuloma inguinale (Donovanosis, granuloma genitoinguinale, granuloma inguinale tropicum, granuloma venereum, granuloma venereum genitoinguinale, lupoid form of groin ulceration, serpiginous ulceration of the groin, ulcerating granuloma of the pudendum, ulcerating sclerosing granuloma)
    Granulomatous facial dermatitis
    Granulomatous perioral dermatitis
    Granulosis rubra nasi
    Green nail syndrome
    Green nails
    Group JK Corynebacterium sepsis
    Grover's disease
    Grover's disease (benign papular acantholytic dermatosis, persistent acantholytic dermatosis, transient acantholytic dermatosis)
    Gustatory hyperhidrosis
    Haber syndrome
    Haemophilus influenzae cellulitis
    Hair bleach-induced
    Hair casts (pseudonits)
    Hair dye-induced
    Hair follicle nevus (vellus hamartoma)
    Hair lotion-induced
    Hair spray-induced
    Hair straightener-induced
    Hair tonic-induced
    Hairy cell leukemia
    Hairy cell leukemia
    Hairy palms and soles
    Half and half nails (Lindsay's nails)
    Hallerman–Streiff syndrome
    Halo nevus (leukoderma acquisitum centrifugum, perinevoid vitiligo, Sutton nevus)
    Halogen acne
    Halogenoderma
    Hamartoma
    Hand eczema
    Hand-foot-and-mouth disease
    Hangnail
    Hapalonychia
    Harlequin-type ichthyosis (harlequin baby, harlequin fetus, harlequin ichthyosis, ichthyosis congenita, ichthyosis congenita gravior)
    Hay–Wells syndrome (AEC syndrome, ankyloblepharon filiforme adnatum–ectodermal dysplasia–cleft palate syndrome, ankyloblepharon–ectodermal defects–cleft lip and palate syndrome, ankyloblepharon–ectodermal dysplasia–clefting syndrome)
    Head and neck cancer
    Heart cancer
    Heck's disease (focal epithelial hyperplasia)
    Helicobacter cellulitis
    Hemangiopericytoma
    Hemangiosarcoma
    Hematidrosis
    Hemihyperplasia–multiple lipomatosis syndrome
    Hemorrhagic fever with renal syndrome
    Heparin necrosis
    Hepatitis B
    Hepatitis C
    Hepatocellular cancer
    Hepatosplenic T-cell lymphoma
    Hereditary sclerosing poikiloderma
    Herpangina
    Herpes gladiatorum (scrum pox)
    Herpes simplex
    Herpes zoster oticus (Ramsay–Hunt syndrome)
    Herpetic keratoconjunctivitis
    Herpetic sycosis
    Herpetic whitlow
    Heterochromia iridum
    Hibernoma (fetal lipoma, lipoma of embryonic fat, lipoma of immature adipose tissue)
    Hidradenitis suppurativa (acne inversa, pyoderma fistulans significa, Verneuil's disease)
    Hidradenocarcinoma
    Hidradenoma
    Hidradenoma
    Hidrocystoma (cystadenoma, Moll's gland cyst, sudoriferous cyst)
    Hirsutism
    HIV disease-related drug reaction
    HIV-associated lipodystrophy[nb 8]
    HIV-associated pruritus
    Hodgkin's lymphoma
    Holocarboxylase synthetase deficiency
    Homocystinuria
    Hook nail
    Hori's nevus (acquired bilateral nevus of Ota-like macules)
    Hospital furunculosis
    Hot comb alopecia
    Hot tub folliculitis (Pseudomonas aeruginosa folliculitis)
    Houseplant-induced
    Human granulocytotropic anaplasmosis
    Human monkeypox
    Human monocytotropic ehrlichiosis
    Human T-lymphotropic virus 1 infection
    Human tanapox
    Hutchinson's teeth
    Hydrocarbon keratosis (pitch keratosis, tar keratosis, tar wart)
    Hydrocarbon-induced
    Hydroxyurea dermopathy
    Hyper-IgD syndrome[nb 7]
    Hypereosinophilia
    Hypereosinophilic syndrome
    Hyperkeratosis lenticularis perstans (Flegel's disease)
    Hyperkeratosis of the nipple and areola
    Hyperkeratotic actinic keratosis
    Hyperkeratotic cutaneous capillary-venous malformation
    Hyperkeratotic hand dermatitis
    Hypertrichosis cubiti (hairy elbow syndrome)
    Hypertrichosis simplex of the scalp
    Hypertrophic scar
    Hypohidrotic ectodermal dysplasia (anhidrotic ectodermal dysplasia, Christ–Siemens–Touraine syndrome)
    Hypopharyngeal cancer
    Hypotrichosis–acro-osteolysis–onychogryphosis–palmoplantar keratoderma–periodontitis syndrome
    Hypotrichosis–lymphedema–telangiectasia syndrome
    Ichthyosis bullosa of Siemens (ichthyosis exfoliativa)
    Ichthyosis follicularis (ichthyosis follicularis with alopecia and photophobia syndrome)
    Ichthyosis hystrix (ichthyosis hystrix gravior type Lambert, porcupine man, systematized verrucous nevus)
    Ichthyosis hystrix of Curth–Macklin
    Ichthyosis linearis circumflexa
    Ichthyosis prematurity syndrome
    Ichthyosis vulgaris (autosomal dominant ichthyosis, ichthyosis simplex)
    Ichthyosis with confetti
    Ichthyosis–brittle hair–impaired intelligence–decreased fertility–short stature syndrome (IBIDS syndrome, sulfur-deficient brittle hair syndrome, Tay's syndrome, trichothiodystrophy, trichothiodystrophy with ichthyosis)
    Id reaction (disseminated eczema, generalized eczema)
    Idiopathic facial aseptic granuloma
    IgA pemphigus
    Immune dysfunction–polyendocrinopathy–enteropathy–X-linked syndrome
    Immune reconstitution inflammatory syndrome (immune recovery syndrome)
    Immunosuppression-associated Kaposi sarcoma
    Impetigo contagiosa
    Incontinentia pigmenti (Bloch–Siemens syndrome, Bloch–Sulzberger disease, Bloch–Sulzberger syndrome)
    Incontinentia pigmenti achromians (hypomelanosis of Ito)
    Infantile acne
    Infantile digital fibromatosis (inclusion body fibromatosis, infantile digital myofibroblastoma, Reye tumor)
    Infantile hemangiopericytoma (congenital hemangiopericytoma)
    Infantile myofibromatosis (congenital generalized fibromatosis, congenital multicentric fibromatosis)
    Infantile systemic hyalinosis (juvenile systemic hyalinosis)
    Infectious mononucleosis (glandular fever)
    Infiltrative basal cell carcinoma
    Inflammatory Breast Cancer
    Inflammatory linear verrucous epidermal nevus
    Inflammatory skin lesions following zoster infection (isotopic response)
    Inherited patterned lentiginosis in black persons
    Injection site reaction
    Ink spot lentigo (sunburn lentigo)
    Intermittent hair–follicle dystrophy
    Interstitial granulomatous dermatitis
    Intradermal spindle cell lipoma
    Intraepidermal neutrophilic IgA dermatosis
    Intrauterine epidermal necrosis
    Intrauterine herpes simplex
    Intravascular large B-cell lymphoma
    Intravascular papillary endothelial hyperplasia (Masson's hemangio-endotheliome vegetant intravasculaire, Masson's lesion, Masson's pseudoangiosarcoma, Masson's tumor, papillary endothelial hyperplasia)
    Invasive cribriform carcinoma
    Invasive lobular carcinoma
    Inverted follicular keratosis
    Involutional lipoatrophy
    Iododerma
    Irritant diaper dermatitis (diaper dermatitis, napkin dermatitis)
    Irritant folliculitis
    Irritated seborrheic keratosis (basosquamous cell acanthoma, inflamed seborrheic keratosis)
    Islet cell carcinoma (endocrine pancreas)
    Isthmicoma (infundibuloma, tumor of the follicular infundibulum)
    Itchy red bump disease (papular dermatitis)
    Jadassohn–Pellizzari anetoderma
    Jaffe–Campanacci syndrome
    Japanese spotted fever
    Johanson–Blizzard syndrome
    Johnson–McMillin syndrome
    Joubert syndrome
    Junctional epidermolysis bullosa
    Junctional epidermolysis bullosa gravis (epidermolysis bullosa letalis, Herlitz disease, Herlitz epidermolysis bullosa, Herlitz syndrome, lethal junctional epidermolysis bullosa)
    Junctional epidermolysis bullosa with pyloric atresia
    Juvenile hyaline fibromatosis (fibromatosis hyalinica multiplex juvenilis, Murray–Puretic–Drescher syndrome)
    Juvenile myelomonocytic leukemia
    Juvenile plantar dermatosis (atopic winter feet, dermatitis plantaris sicca, forefoot dermatitis, moon-boot foot syndrome, sweaty sock dermatitis)
    Juvenile rheumatoid arthritis (juvenile idiopathic arthritis, Still's disease)
    Juvenile xanthogranuloma
    Kabuki syndrome (Kabuki makeup syndrome, Niikawa–Kuroki syndrome)
    Kaposi sarcoma
    Kaposi sarcoma
    Kaposi sarcoma
    Kaposiform hemangioendothelioma (infantile kaposiform hemangioendothelioma)
    Kasabach–Merritt syndrome (hemangioma with thrombocytopenia)
    Keloid
    Keloid (Keloidal scar)
    Keloid morphea
    Keratin implantation cyst
    Keratinizing metaplasia
    Keratoacanthoma
    Keratoacanthoma centrifugum marginatum
    Keratocyst
    Keratolytic winter erythema (erythrokeratolysis hiemalis, Oudtshoorn disease, Oudtshoorn skin)
    Keratosis follicularis spinulosa decalvans (Siemens-1 syndrome)
    Keratosis linearis with ichthyosis congenital and sclerosing keratoderma syndrome
    Keratosis pilaris
    Keratosis pilaris
    Keratosis pilaris atrophicans
    Keratosis pilaris atrophicans faciei (folliculitis rubra, keratosis pilaris rubra atrophicans faciei, lichen pilare, lichen pilaire ou xerodermie pilaire symmetrique de la face', ulerythema ophryogenes, xerodermi pilaire symmetrique de la face)
    Kimura's disease
    Kindler syndrome (acrokeratotic poikiloderma, bullous acrokeratotic poikiloderma of Kindler and Weary, congenital poikiloderma with blisters and keratoses, congenital poikiloderma with bullae and progressive cutaneous atrophy, hereditary acrokeratotic poikiloderma, hyperkeratosis–hyperpigmentation syndrome, Weary–Kindler syndrome)
    Kinking hair (acquired progressive kinking)
    Klinefelter syndrome
    Klippel–Feil syndrome
    Klippel–Trenaunay syndrome (angioosteohypertrophy syndrome, hemangiectatic hypertrophy)
    Knuckle pads (heloderma)
    Koenen's tumor (Koenen's periungual fibroma, periungual fibroma)
    Koilonychia (spoon nails)
    Kyrle disease
    Lacquer dermatitis (lacquer sensitivity)
    Lamellar ichthyosis (collodion baby)
    Lanolin-induced
    Large cell acanthoma
    Large granular lymphocytic leukemia
    Large, red, exophytic nodule on the malar surface of an adult
    Laryngeal cancer
    Lassa fever
    Laugier–Hunziker syndrome
    Legius syndrome (neurofibromatosis type 1-like syndrome)
    Leiomyosarcoma
    Lelis syndrome
    Lentigo simplex (simple lentigo)
    Lenz–Majewski syndrome
    Leptospirosis (Fort Bragg fever, pretibial fever, Weil's disease)
    Leschke syndrome
    Lethal acantholytic epidermolysis bullosa
    Leukonychia (white nails)
    Leukotriene receptor antagonist-associated Churg–Strauss syndrome
    Lhermitte–Duclos disease
    Lichen planopilaris (acuminatus, follicular lichen planus, lichen planus follicularis, peripilaris)
    Lichen planus of the nails
    Lichen spinulosus (keratosis spinulosa)
    Lichenoid actinic keratosis
    Lichenoid keratosis (benign lichenoid keratosis, lichen planus-like keratosis, solitary lichen planus, solitary lichenoid keratosis)
    Limb–mammary syndrome
    Linear and whorled nevoid hypermelanosis (linear nevoid hyperpigmentation, progressive cribriform and zosteriform hyperpigmentation, reticulate and zosteriform hyperpigmentation, reticulate hyperpigmentation of Iijima and Naito and Uyeno, zebra-like hyperpigmentation in whorls and streaks, zebra-line hyperpigmentation)
    Linear atrophoderma of Moulin (Moulin atrophoderma linearis)
    Linear Darier disease
    Linear Darier disease (acantholytic dyskeratotic epidermal nevus)
    Linear focal elastosis (elastotic striae)
    Linear IgA bullous dermatosis (linear IgA dermatosis)
    Linear porokeratosis
    Linear scleroderma
    Linear verrucous epidermal nevus (linear epidermal nevus, verrucous epidermal nevus)
    Lipedematous alopecia (lipedematous scalp)
    Lipoatrophia annularis (Ferreira–Marques lipoatrophia)
    Lipoatrophia semicircularis (semicircular lipoatrophy)
    Lipodermatosclerosis (chronic panniculitis with lipomembranous changes, hypodermitis sclerodermiformis, sclerosing panniculitis, stasis panniculitis)
    Lipohypertrophy
    Lipoma
    Liposarcoma (atypical lipoma, atypical lipomatous tumor)
    LipschĂĽtz ulcer (ulcus vulvae acutum)
    Lipstick-induced
    Listeriosis
    Local anesthetic-induced
    Localized acquired hypertrichosis
    Localized cicatricial pemphigoid (Brunsting–Perry cicatricial pemphigoid)
    Localized congenital hypertrichosis
    Localized discoid lupus erythematosus
    Localized epidermolysis bullosa simplex (Weber–Cockayne syndrome, Weber–Cockayne variant of generalized epidermolysis bullosa simplex)
    Localized lichen myxedematosus
    Localized lipodystrophy
    Localized morphea
    Localized morphea
    Loeys–Dietz syndrome
    Longitudinal erythronychia
    Longitudinal melanonychia
    Loose anagen syndrome (loose anagen hair syndrome)
    Lowry–MacLean syndrome
    Ludwig's angina
    Lupoid rosacea (granulomatous rosacea, micropapular tuberculid, rosacea-like tuberculid of Lewandowsky)
    Lupoid sycosis
    Lupus erythematosus
    Lupus erythematosus panniculitis (lupus erythematosus profundus, lupus panniculitis, lupus profundus, subcutaneous lupus erythematosus)
    Lupus erythematosus–lichen planus overlap syndrome (lichen planus–lupus erythematosus overlap syndrome)
    Lupus miliaris disseminatus faciei
    Lyme disease (Afzelius' disease, Lyme borreliosis)
    Lymphangiectasis (lymphangioma)
    Lymphangiomatosis
    Lymphogranuloma venereum (climatic bubo, Durand–Nicolas–Favre disease, lymphogranuloma inguinale, poradenitis inguinale, strumous bubo)
    Lymphomatoid granulomatosis
    Lymphoplasmacytic lymphoma
    Macrocheilia
    Macrocystic lymphatic malformation
    Madarosis
    Majeed syndrome
    Makassar ebony dermatitis
    Malakoplakia (malacoplakia)
    Malalignment of the nail plate
    Male breast cancer
    Male-pattern baldness
    Malignant acrospiroma (malignant poroma, porocarcinoma, spiradenocarcinoma)
    Malignant blue nevus
    Malignant fibrous histiocytoma
    Malignant fibrous histiocytoma of bone/osteosarcoma
    Malignant mixed tumor (malignant chondroid syringoma)
    Malignant peripheral nerve sheath tumor (malignant schwannoma, neurofibrosarcoma, neurosarcoma)
    Malignant pilomatricoma (pilomatrical carcinoma, pilomatrix carcinoma)
    Malignant trichilemmal cyst
    Mandibuloacral dysplasia
    Mantle cell lymphoma
    Mantleoma
    Many hyperkeratotic, vegetative, and hyperpigmented papules in a zosteriform pattern on the right lateral lower extremity of an adult
    Many small to large, skin colored nodules on the trunk of an adult
    Marfan syndrome
    Marginal zone B-cell lymphoma
    Marie–Unna hereditary hypotrichosis (Marie–Unna hypotrichosis)
    Marine plant-induced
    Marinesco–Sjögren syndrome
    Marjolin's ulcer
    Mast cell leukemia
    Mast cell sarcoma
    Maternal autoimmune bullous disease
    McCune–Albright syndrome
    McCusick syndrome
    Measles (rubeola, morbilli)
    Mechanical irritant dermatitis
    Median nail dystrophy (dystrophia unguis mediana canaliformis, median canaliform dystrophy of Heller, solenonychia)
    Median raphe cyst
    Mediastinal large B cell lymphoma
    Mediterranean spotted fever (Boutonneuse fever)
    Medium-sized congenital nevocytic nevus
    Medullary carcinoma
    Medulloblastoma
    Mees' lines
    Melanoacanthoma
    Melanoacanthoma (pigmented seborrheic keratosis)
    Melanocytic tumors of uncertain malignant potential
    Melanoma
    Melanonychia
    Melanotic neuroectodermal tumor of infancy
    Melioidosis (Whitmore's disease)
    Membranous aplasia cutis
    Meningocele
    Meningococcemia
    Menkes kinky hair syndrome (kinky hair disease, Menkes disease)
    Mercury dermatitis
    Merkel cell carcinoma
    Merkel cell carcinoma (cutaneous apudoma, primary neuroendocrine carcinoma of the skin, primary small cell carcinoma of the skin, trabecular carcinoma of the skin)
    Mesothelioma
    Metageria
    Metastatic carcinoma
    Methotrexate-induced papular eruption
    Metophyma
    Microcystic adnexal carcinoma (sclerosing sweat duct carcinoma)
    Microcystic lymphatic malformation
    Micronodular basal cell carcinoma
    Microphthalmia–dermal aplasia–sclerocornea syndrome
    Microvenular hemangioma (microcapillary hemangioma)
    Midline cervical cleft
    Midline nevus flammeus (angel's kiss, salmon patch)
    Milia en plaque
    Milium
    Milium
    Milker's nodule
    Missouri Lyme disease
    Mitis junctional epidermolysis bullosa (nonlethal junctional epidermolysis bullosa)
    Mitochondrial myopathy–encephalopathy–lactic acidosis–stroke syndrome
    Mixed connective tissue disease (Sharp's syndrome, undifferentiated connective tissue disease)
    Mixed tumor (chondroid syringoma)
    Modified varicella-like syndrome
    Molluscum contagiosum
    Molluscum dermatitis
    Mongolian spot
    Mongolian spot (congenital dermal melanocytosis, dermal melanocytosis)
    Monilethrix (beaded hair)
    Morphea profunda
    Morphea–lichen sclerosus et atrophicus overlap
    Mouth and genital ulcers with inflamed cartilage syndrome (MAGIC syndrome)
    Mouthwash-induced
    Moynahan syndrome
    Mucinous carcinoma
    Mucinous nevus (nevus mucinosus)
    Muckle–Wells syndrome
    Mucosa-associated lymphoid tissue lymphoma
    Mucosal lentigines (labial and penile and vulvar melanosis, melanotic macules)
    Muehrcke's nails (Muehrcke's lines)
    Muir–Torre syndrome
    Mulberry molar
    Multifocal lymphangioendotheliomatosis (congenital cutaneovisceral angiomatosis with thrombocytopenia, multifocal lymphangioendotheliomatosis with thrombocytopenia)
    Multinucleate cell angiohistocytoma
    Multiple cutaneous and uterine leiomyomatosis syndrome (leiomyomatosis cutis et uteri, multiple leiomyomatosis, Reed's syndrome)
    Multiple cutaneous leiomyoma (pilar leiomyoma)
    Multiple dark red skin lesions
    Multiple endocrine neoplasia syndrome
    Multiple familial trichoepithelioma (Brooke–Spiegler syndrome, epithelioma adenoides cysticum)
    Multiple keratoacanthomas (Ferguson–Smith syndrome, Ferguson-Smith type of multiple self-healing keratoacanthomas, multiple keratoacanthomas of the Ferguson–Smith type)
    Multiple lentigines syndrome (cardiocutaneous syndrome, Gorlin syndrome II, lentiginosis profusa syndrome, LEOPARD syndrome, progressive cardiomyopathic lentiginosis)
    Multiple minute digitate hyperkeratosis (digitate keratoses, disseminated spiked hyperkeratosis, familial disseminated piliform hyperkeratosis, minute aggregate keratosis)
    Multiple myeloma/plasma cell neoplasm
    Multiple pterygium syndrome
    Multiple red papules scattered over a child's head, neck, trunk, and upper extremities
    Multiple reddish-brown papules coalescing over the right arm of a boy
    Multiple small subcorneal pustules on erythematous patches
    Multiple sulfatase deficiency (Austin disease, mucosulfatidosis)
    Multiple tan patches scattered over the back of a young child
    Multiple, dystrophic, irregular, shortened fingernails
    Multiple, small, blue to red papules on the scrotum
    Mycoplasma infection
    Mycosis fungoides
    Myelodysplastic syndromes
    Myrmecia
    Myxoid cyst (digital mucous cyst, mucous cyst)
    Myxoid lipoblastoma
    Naegeli–Franceschetti–Jadassohn syndrome (chromatophore nevus of Naegeli)
    Nager acrofacial dysostosis
    Nail lacquer-induced
    Nail polish remover-induced
    Nail–patella syndrome
    Nail–patella syndrome (Fong syndrome, hereditary osteoonychodysplasia, HOOD syndrome)
    Nasal glioma (brain-like heterotopia, cephalic brain-like heterotopia, glial hamartoma, heterotopic neuroglial tissue, nasal cerebral heterotopia, nasal heterotopic brain tissue)
    Nasolacrimal duct cyst
    Nasopharyngeal carcinoma
    Necrolytic acral erythema
    Necrolytic migratory erythema
    Necrotizing fasciitis (flesh-eating bacteria syndrome)
    Neonatal acne (acne infantum, acne neonatorum, neonatal cephalic pustulosis)
    Neonatal herpes simplex
    Neonatal ichthyosis–sclerosing cholangitis syndrome (ichthyosis–sclerosing cholangitis syndrome, NISCH syndrome)
    Neonatal lupus erythematosus
    Neonatal toxic shock-like exanthematous disease
    Neoplasms of the nailbed
    Nephrogenic systemic fibrosis (nephrogenic fibrosing dermopathy)
    Netherton syndrome
    Neural fibrolipoma
    Neuroblastoma
    Neuroblastoma (infantile neuroblastoma, neuroepithelioma)
    Neurofibromatosis type 1
    Neurofibromatosis type 1 (von Recklinghausen's disease)
    Neurofibromatosis type 3 (neurofibromatosis mixed type)
    Neurofibromatosis type 4 (neurofibromatosis variant type)
    Neuroma cutis
    Neuropathia mucinosa cutanea
    Neurothekeoma (bizarre cutaneous neurofibroma, cutaneous lobular neuromyxoma, myxoma of the nerve sheath, myxomatous perineurioma, nerve sheath myxoma)
    Neutral lipid storage disease (Dorfman–Chanarin syndrome)
    Neutrophilic lobular panniculitis
    Nevoid basal cell carcinoma syndrome (basal cell nevus syndrome, Gorlin syndrome, Gorlin–Goltz syndrome)
    Nevoid hypertrichosis
    Nevus comedonicus (comedo nevus)
    Nevus comedonicus syndrome
    Nevus flammeus (capillary malformation, port-wine stain)
    Nevus flammeus nuchae (stork bite)
    Nevus lipomatosus superficialis (nevus lipomatosis of Hoffman and Zurhelle)
    Nevus of Ito (nevus fuscoceruleus acromiodeltoideus)
    Nevus of Ota (congenital melanosis bulbi, melanosis bulborum and aberrant dermal melanocytosis, nevus fuscoceruleus ophthalmomaxillaris, oculodermal melanocytosis, oculomucodermal melanocytosis)
    Nevus oligemicus
    Nevus psiloliparus
    Nevus sebaceous (nevus sebaceous of Jadassohn, organoid nevus)
    Nevus spilus (speckled lentiginous nevus, zosteriform lentiginous nevus)
    Nevus unius lateris
    Nickel dermatitis
    Nicolau–Balus syndrome
    Nocardiosis
    Nodal marginal zone B cell lymphoma
    Nodular basal cell carcinoma (classic basal cell carcinoma)
    Nodular fasciitis (nodular pseudosarcomatous fasciits, pseudosarcomatous fasciitis, subcutaneous pseudosarcomatous fibromatosis)
    Nodular lichen myxedematosus
    Nodular vasculitis
    Nodules–eosinophilia–rheumatism–dermatitis–swelling syndrome
    Nodulosis–arthropathy–osteolysis syndrome
    Noma neonatorum
    Non-Hodgkin lymphoma
    Non-involuting congenital hemangioma
    Non-progressive late-onset linear hemifacial lipoatrophy
    Non-small cell lung cancer
    Nonbullous congenital ichthyosiform erythroderma (congenital ichthyosiform erythroderma)
    Noncicatricial alopecia
    Noonan syndrome
    Normophosphatemic familial tumoral calcinosis
    North Asian tick typhus
    Nummular dermatitis (discoid eczema, microbial eczema, nummular eczema, nummular neurodermatitis)
    Nutritional deficiency eczema
    Occipital horn syndrome
    Occupation-induced
    Occupational acne
    Ocular rosacea (ophthalmic rosacea, ophthalmorosacea)
    Oculocerebrocutaneous syndrome (Delleman–Oorthuys syndrome)
    Oculodentodigital dysplasia
    Odonto–Tricho–Ungual–Digital–Palmar syndrome
    Oil acne
    Oligodendroglioma
    Oliver–McFarlane syndrome
    Omphalomesenteric duct cyst (omphalomesenteric duct remnant, vitelline cyst)
    Onychauxis
    Onychoatrophy
    Onychocryptosis (ingrown nail, unguis incarnatus)
    Onychogryphosis (ram's horn nails)
    Onycholysis
    Onychomadesis
    Onychomatricoma
    Onychophagia (nail biting)
    Onychophosis
    Onychoptosis defluvium (alopecia unguium)
    Onychorrhexis (brittle nails)
    Onychoschizia
    Onychotillomania
    Onychotillomania
    Ophiasis
    Ophthalmia neonatorum
    Ophthalmic zoster
    Oral cancer
    Oral submucous fibrosis
    Orf (contagious pustular dermatosis, ecthyma contagiosum, infectious labial dermatitis, sheep pox)
    Orf-induced immunobullous disease
    Orofaciodigital syndrome
    Orolabial herpes (herpes labialis)
    Oropharyngeal cancer
    Oroya fever (Carrion's disease)
    Osteogenesis imperfecta (Lobstein syndrome)
    Osteosarcoma
    Otophyma
    Ovarian cancer
    Ovarian epithelial cancer (surface epithelial-stromal tumor)
    Ovarian germ cell tumor
    p-Chloro-meta-xylenol-induced
    Pachydermatous eosinophilic dermatitis
    Pachydermodactyly
    Pachydermoperiostosis (idiopathic hypertrophic osteoathorpathy, Touraine–Solente–Gole syndrome)
    Paget's disease of the breast
    Palisaded encapsulated neuroma
    Palisaded neutrophilic and granulomatous dermatitis
    Palmoplantar hyperhidrosis (emotional hyperhidrosis)
    Pancreatic cancer, islet cell
    Pancreatic panniculitis (enzymatic panniculitis, pancreatic fat necrosis, subcutaneous fat necrosis)
    Pansclerotic morphea
    Papillary eccrine adenoma (tubular apocrine adenoma)
    Papillary hidradenoma (hidradenoma papilliferum)
    Papillomatosis cutis carcinoides (Gottron's carcinoid papillomatosis, papillomatosis cutis carcinoides of Gottron–Eisenlohr)
    Papular eruption of blacks
    Papular mucinosis (generalized lichen myxedematosus, sclerodermoid lichen myxedematosus, scleromyxedema)
    Papular mucinosis of infancy (cutaneous mucinosis of infancy)
    Papular purpuric gloves and socks syndrome
    Papuloerythroderma of Ofuji
    Papulopustular rosacea (inflammatory rosacea)
    Paraben-induced
    Parakeratosis pustulosa
    Paranasal sinus and nasal cavity cancer
    Paraneoplastic pemphigus
    Paraneoplastic syndrome
    Paraphenylenediamine dermatitis
    Parathyroid cancer
    Parry–Romberg syndrome (progressive hemifacial atrophy)
    Partial unilateral lentiginosis (segmental lentiginosis)
    Pasteurellosis
    Patch blue nevus (acquired dermal melanocytosis, dermal melanocyte hamartoma)
    Patterned acquired hypertrichosis
    Pearly penile papules (hirsuties coronae glandis, hirsutoid papillomas)
    Peeling skin syndrome (acral peeling skin syndrome, continual peeling skin syndrome, familial continual skin peeling, idiopathic deciduous skin, keratolysis exfoliativa congenita)
    PELVIS syndrome
    Pemphigoid nodularis
    Pemphigus erythematosus (Senear–Usher syndrome)
    Pemphigus foliaceus
    Pemphigus herpetiformis (acantholytic herpetiform dermatitis, herpetiform pemphigus, mixed bullous disease, pemphigus controlled by sulfapyridine)
    Pemphigus vegetans
    Pemphigus vegetans of Hallopeau
    Pemphigus vegetans of Neumann
    Pemphigus vulgaris
    Penile cancer
    Perforating calcific elastosis (localized acquired cutaneous pseudoxanthoma elasticum, perforating periumbilical calcific elastosis, periumbilical perforating pseudoxanthoma elasticum)
    Perforating folliculitis
    Perianal cellulitis (perineal dermatitis, streptococcal perianal disease)
    Periapical abscess
    Perifollicular fibroma
    Perifollicular mucinosis
    Perifolliculitis capitis abscedens et suffodiens (dissecting cellulitis of the scalp, dissecting folliculitis, perifolliculitis capitis abscedens et suffodiens of Hoffman)
    Perioral dermatitis
    Periorbital dermatitis (periocular dermatitis)
    Periorificial dermatitis
    Permanent wave preparation-induced
    Persistent edema of rosacea (chronic upper facial erythematous edema, Morbihan's disease, rosaceous lymphedema)
    Peutz–Jeghers syndrome
    Peyronie's disease (induratio penis plastica)
    Pfeiffer syndrome
    Phakomatosis pigmentokeratotica
    Phakomatosis pigmentovascularis
    Pharyngeal cancer
    Phenothiazine drug-induced
    Pheochromocytoma
    Photoallergic
    Photoirritant
    Photosensitive drug reaction
    Photosensitivity–ichthyosis–brittle sulfur-deficient hair–impaired intelligence–decreased fertility–short stature syndrome
    Phyllodes tumor
    Phymatous rosacea
    Pigmented actinic keratosis
    Pigmented basal cell carcinoma
    Pigmented hairy epidermal nevus syndrome
    Pigmented spindle cell nevus (pigmented spindle cell tumor of Reed, pigmented variant of Spitz nevus)
    Pigmented wart
    Pilar sheath acanthoma
    Pili annulati (ringed hair)
    Pili bifurcati
    Pili multigemini
    Pili pseudoannulati (pseudo pili annulati)
    Pili torti (twisted hairs)
    Pilocytic astrocytoma
    Piloleiomyoma
    Pilomatricoma (calcifying epithelioma of Malherbe, Malherbe calcifying epithelioma, pilomatrixoma)
    Pilonidal sinus (Barber's interdigital pilonidal sinus, pilonidal cyst, pilonidal disease)
    Pincer nails (omega nails, trumpet nails)
    Pineal astrocytoma
    Pinta
    Pitted keratolysis (keratolysis plantare sulcatum, keratoma plantare sulcatum, ringed keratolysis)
    Pituitary adenoma
    Pityriasis amiantacea (tinea amiantacea)
    Pityriasis rotunda (pityriasis circinata, tinea circinata)
    Plague
    Plant derivative-induced
    Plantar fibromatosis (Ledderhose's disease)
    Plaque-type porokeratosis (classic porokeratosis, porokeratosis of Mibelli)
    Plasmablastic lymphoma
    Plate-like osteoma cutis
    Platonychia
    Pleomorphic fibroma
    Pleomorphic lipoma
    Pleuropulmonary blastoma
    Plexiform fibrohistiocytic tumor
    Plica neuropathica (felted hair)
    Plummer's nail
    Poland anomaly
    Poland's syndrome
    Pollen-induced
    Polyester resin dermatitis
    Polyneuropathy–organomegaly–endocrinopathy–monoclonal gammopathy–skin changes syndrome (Crow–Fukase syndrome)
    Polyostotic fibrous dysplasia (Albright's disease)
    Polypoid basal cell carcinoma
    Pomade acne
    Popliteal pterygium syndrome
    Pore-like basal cell carcinoma
    Porokeratosis
    Porokeratosis palmaris et plantaris disseminata
    Porokeratotic eccrine ostial and dermal duct nevus
    Post-steroid panniculitis
    Post-vaccination follicular eruption
    Posterior fossa malformations–hemangiomas–arterial anomalies–cardiac defects–eye abnormalities–sternal cleft and supraumbilical raphe syndrome (PHACE association, PHACES syndrome)
    Postherpetic neuralgia (zoster-associated pain)
    Prader–Willi syndrome
    Preauricular sinus and cyst (ear pit, congenital auricular fistula, congenital preauricular fistula, preauricular cyst)
    Precursor B lymphoblastic leukemia
    Premature greying of hair
    Prepubertal hypertrichosis
    Pressure alopecia (postoperative alopecia, pressure-induced alopecia)
    Primary central nervous system lymphoma
    Primary cutaneous adenoid cystic carcinoma
    Primary cutaneous follicular lymphoma
    Primary cutaneous immunocytoma
    Primary effusion lymphoma
    Primary gonococcal dermatitis
    Primitive neuroectodermal tumor
    Progeria (Hutchinson–Gilford progeria syndrome, Hutchinson–Gilford syndrome, progeria syndrome)
    Progressive nodular histiocytoma
    Progressive osseous heteroplasia
    Progressive symmetric erythrokeratodermia (erythrokeratodermia progressiva symmetrica)
    Progressive systemic sclerosis
    Progressive vaccinia (vaccinia gangrenosum, vaccinia necrosum)
    Proliferating angioendotheliomatosis
    Proliferating epidermoid cyst (proliferating epithelial cyst)
    Proliferating trichilemmal cyst (pilar tumor, proliferating follicular cystic neoplasm, proliferating pilar tumor, proliferating trichilemmal tumor)
    Prominent inferior labial artery
    Propylene glycol-induced
    Prostate cancer
    Protein contact dermatitis
    Proteus syndrome
    Proteus-like syndrome
    Pruritic papular eruption of HIV disease
    Pseudo-ainhum
    Pseudocowpox
    Pseudocyst of the auricle (auricular endochondrial pseudocyst, cystic chondromalacia, endochondral pseudocyst, intracartilaginous cyst)
    Pseudoepitheliomatous keratotic and micaceous balanitis
    Pseudofolliculitis barbae (barber's itch, folliculitis barbae traumatica, razor bumps, scarring pseudofolliculitis of the beard, shave bumps)
    Pseudomelanoma (recurrent melanocytic nevus, recurrent nevus)
    Pseudomonal pyoderma
    Pseudomonas hot-foot syndrome
    Pseudopelade of Brocq (alopecia cicatrisata)
    Pseudoxanthoma elasticum (Grönblad–Strandberg syndrome)
    Psoriatic nails
    Pterygium inversum unguis (pterygium inversus unguis, ventral pterygium)
    Pterygium unguis (dorsal pterygium)
    Punctate porokeratosis
    Purpura of the nail bed
    PUVA keratosis
    PUVA lentigines
    Pyoderma faciale (rosacea fulminans)
    Pyogenic paronychia
    Pyomyositis
    Q fever
    Quaternium-15 hypersensitivity
    Queensland tick typhus
    Racquet nail (brachyonychia, nail en raquette, racquet thumb)
    Rapidly involuting congenital hemangioma (congenital nonprogressive hemangioma)
    Rapp–Hodgkin syndrome (Rapp–Hodgkin ectodermal dysplasia syndrome)
    Rasmussen syndrome
    Rat-bite fever
    Reactional keratosis
    Reactive perforating collagenosis
    Recessive dystrophic epidermolysis bullosa (Hallopeau–Siemens variant of epidermolysis bullosa, Hallopeau–Siemens disease)
    Rectal cancer
    Recurrent palmoplantar hidradenitis (idiopathic palmoplantar hidradenitis, idiopathic plantar hidradenitis, painful plantar erythema, palmoplantar eccrine hidradenitis, plantar panniculitis)
    Recurrent respiratory papillomatosis (laryngeal papillomatosis)
    Recurrent toxin-mediated perineal erythema
    Red erosions, some with crusting, all on the back of an adult hand
    Red lunulae
    Red man syndrome
    Redness and mild swelling of an adult leg
    Redness and swelling of an ear
    Reed dermatitis
    Refsum's disease (heredopathia atactica polyneuritiformis, phytanic acid storage disease)
    Relapsing linear acantholytic dermatosis
    Relapsing polychondritis (atrophic polychondritis, systemic chondromalacia)
    Renal cell carcinoma
    Renal pelvis and ureter, transitional cell cancer
    Restrictive dermopathy
    Reticular erythematous mucinosis (midline mucinosis, plaque-like cutaneous mucinosis, REM syndrome)
    Reticulated seborrheic keratosis (adenoid seborrheic keratosis)
    Retiform hemangioendothelioma (hobnail hemangioendothelioma)
    Retinoblastoma
    Rhabdomyosarcoma
    Rheumatoid arthritis
    Rheumatoid nodulosis (accelerated rheumatoid nodulosis)
    Rheumatoid vasculitis
    Rhinophyma
    Rhinophyma
    Rhinoscleroma
    Rhizomelic chondrodysplasia punctata (autosomal recessive chondrodysplasia punctata type 1, chondrodystrophia calcificans punctata, peroxisomal biogenesis disorder complementation group 11)
    Rickettsia aeschlimannii infection
    Rickettsialpox
    Rift Valley fever
    Rocky Mountain spotted fever
    Rodent ulcer (Jacobi ulcer)
    Rombo syndrome
    Rosacea (acne rosacea)
    Rosacea conglobata
    Rosenthal–Kloepfer syndrome
    Roseola infantum (exanthem subitum, exanthema subitum, sixth disease)
    Roseola vaccinia
    Rosewood dermatitis
    Rosin dermatitis
    Ross' syndrome
    Rothmund–Thomson syndrome (poikiloderma congenitale)
    Rowell's syndrome
    Rubber dermatitis
    Rubella (German measles)
    Rubinstein–Taybi syndrome
    Rud syndrome
    Rudimentary supernumerary digit (rudimentary polydactyly)
    rythema annulare centrifugum (deep gyrate erythema, erythema perstans, palpable migrating erythema, superficial gyrate erythema)
    Saber shin (anterior tibial bowing)
    SACRAL syndrome
    Saddle nose
    Salivary gland cancer
    Salmonellosis
    Sandfly fever (Pappataci fever, phlebotomus fever)
    Say syndrome
    Scalp–ear–nipple syndrome (Finlay–Marks syndrome)
    Scarlet fever
    Schimmelpenning syndrome (Schimmelpenning–Feuerstein–Mims syndrome)
    Schindler disease (Kanzaki disease, alpha-N-acetylgalactosaminidase deficiency)
    Schinzel–Giedion syndrome
    Schwannoma (acoustic neuroma, neurilemmoma, neurinoma, neurolemmoma, Schwann cell tumor)
    Schweninger–Buzzi anetoderma
    Scleredema adultorum (Bushke disease, scleredema diabeticorum, scleredema adultorum of Buschke, scleredema of Buschke)
    Sclerema neonatorum
    Scleroatrophic syndrome of Huriez (Huriez syndrome, palmoplantar keratoderma with scleroatrophy, palmoplantar keratoderma with sclerodactyly, scleroatrophic and keratotic dermatosis of the limbs, sclerotylosis)
    Scleroderma
    Scleroderma-like reaction to taxanes
    Sclerosing lipogranuloma (paraffinoma)
    Sclerotic fibroma
    Scrub typhus (Tsutsugamushi fever)
    Sealpox
    Sebaceoma (sebaceous epithelioma)
    Sebaceous adenoma
    Sebaceous carcinoma
    Sebaceous hyperplasia
    Sebaceous nevus syndrome
    Seboacanthoma
    Seborrheic keratosis (seborrheic verruca, senile wart)
    Seborrheic keratosis with squamous atypia
    Seed-induced
    Segmental neurofibromatosis
    Self-healing juvenile cutaneous mucinosis
    Self-healing papular mucinosis
    Senter syndrome (Desmons' syndrome)
    Septal panniculitis
    Serum sickness-like reaction
    Setleis syndrome
    Several light blue patches of skin distributed over a child's lower back and buttock
    Severe cutaneous adverse reactions (includes DRESS syndrome, Steven Johnson syndrome, Toxic epidermal necrolysis, Stevens-Johnson/toxic epidermal necrolysis overlap syndrome, and Acute generalized exanthematous pustulosis)
    SĂ©zary syndrome
    Shabbir syndrome (laryngo–onycho–cutaneous syndrome)
    Shell nail syndrome
    Shigellosis
    Shoe dermatitis
    Short anagen syndrome
    Signet-ring cell squamous cell carcinoma
    Silicosis
    Silver–Russell syndrome
    Sinus pericranii
    Sjögren–Larsson syndrome
    Sjögren's syndrome (Mikulicz disease, Sicca syndrome)
    Skin cancer (non-melanoma)
    Skin dimple (skin fossa)
    Skin fragility syndrome (plakophilin 1 deficiency)
    Small cell lung cancer
    Small-sized congenital nevocytic nevus
    Small, linear, blue-black areas of discoloration beneath the nail plate of an adult finger
    Small, raised, skin-colored lesions
    Small, red, monomorphic skin lesions on the back of an adult arm
    Smith–Lemli–Opitz syndrome
    Solar lentigo
    Solitary angiokeratoma
    Solitary cutaneous leiomyoma
    Solitary keratoacanthoma (subungual keratoacanthoma)
    Solitary mastocytoma
    Solitary neurofibroma (plexiform neurofibroma, solitary nerve sheath tumor, sporadic neurofibroma)
    Solitary trichoepithelioma
    Solitary, large, white to yellow erosion on the inner lower lip of a child
    Solitary, pink, dome-shaped papule on the superior helix of an adult
    Solitary, pink, pearly appearing skin lesion on the side of an adult nose
    Solvent-induced
    Sorbic acid-induced
    Spider angioma (nevus araneus, spider telangiectasia, spider nevus, vascular spider)
    Spindle cell hemangioendothelioma (spindle cell hemangioma)
    Spindle cell lipoma
    Spindle cell squamous cell carcinoma (spindle cell carcinoma)
    Spiradenoma
    Spitz nevus (benign juvenile melanoma, epithelioid and spindle cell nevus, Spitz's juvenile melanoma)
    Splenic marginal zone lymphoma
    Splinter hemorrhage
    Splinter hemorrhage
    Spotted lunulae
    Squamous cell carcinoma
    Squamous cell carcinoma
    Staining of the nail plate
    Staphylococcal scalded skin syndrome (pemphigus neonatorum, Ritter's disease)
    Steatocystoma multiplex (epidermal polycystic disease, sebocystomatosis)
    Steatocystoma simplex (simple sebaceous duct cyst, solitary steatocystoma)
    Sternal cleft
    Steroid acne
    Steroid folliculitis
    Steroid rosacea
    Stevens–Johnson syndrome
    Stiff skin syndrome
    Stippled nails
    Streptococcal intertrigo
    Striae atrophicans
    Striae distensae
    Stucco keratosis (digitate seborrheic keratosis, hyperkeratotic seborrheic keratosis, keratosis alba, serrated seborrheic keratosis, verrucous seborrheic keratosis)
    Sturge–Weber syndrome
    Subacute cutaneous lupus erythematosus
    Subcutaneous fat necrosis of the newborn
    Subjective irritant contact dermatitis (sensory irritant contact dermatitis)
    Subungual exostosis
    Subungual hematoma
    Sulfonamide hypersensitivity syndrome
    Sulzberger–Garbe syndrome (oid-oid disease)
    Sunscreen-induced
    Superficial acral fibromyxoma
    Superficial basal cell carcinoma (superficial multicentric basal cell carcinoma)
    Superficial lymphatic malformation (lymphangioma circumscriptum)
    Superficial pustular folliculitis (impetigo of Bockhart, superficial folliculitis)
    Supernumerary nipple (accessory nipple, pseudomamma)
    Supernumerary nipples–uropathies–Becker's nevus syndrome
    Sycosis vulgaris (barber's itch, sycosis barbae)
    Synovitis–acne–pustulosis–hyperostosis–osteomyelitis syndrome (SAPHO syndrome)[nb 6]
    Syphilid
    Syphilis (lues)
    Syringadenoma papilliferum (syringocystadenoma papilliferum)
    Syringofibroadenoma (acrosyringeal nevus of Weedon and Lewis)
    Syringoma
    Systematized epidermal nevus
    Systemic contact dermatitis
    Systemic lupus erythematosus
    Systemic mastocytosis
    T-cell prolymphocytic leukemia
    Tar acne
    Targetoid hemosiderotic hemangioma (hobnail hemangioma)
    Tear gas dermatitis
    Telangiectasia
    Telangiectasia macularis eruptiva perstans
    Telogen effluvium
    Teratoma
    Terminal osseous dysplasia with pigmentary defects
    Terry's nails
    Testicular cancer
    Texier's disease
    Textile dermatitis
    The lower back of an adult with thickened, indurated patches of skin
    Thermal keratosis
    Thick, fish-like scales on an adult lower leg
    Thymoma and thymic carcinoma
    Thyroglossal duct cyst
    Thyroid cancer
    Tick-borne lymphadenopathy
    TNF receptor associated periodic syndrome
    Tooth and nail syndrome (hypodontia with nail dysgenesis, Witkop syndrome)
    Townes–Brocks syndrome
    Toxic epidermal necrolysis (Lyell's syndrome)
    Toxic oil syndrome
    Toxic shock syndrome (streptococcal toxic shock syndrome, streptococcal toxic shock-like syndrome, toxic streptococcal syndrome)
    Toxicodendron dermatitis
    Traction alopecia
    Transient bullous dermolysis of the newborn
    Traumatic alopecia
    Traumatic anserine folliculosis
    Traumatic irritant contact dermatitis
    Traumatic panniculitis
    Treacher Collins syndrome (Treacher Collins–Franceschetti syndrome)
    Tree-associated plant-induced
    Tree-induced
    Trench fever (five-day fever, quintan fever, urban trench fever)
    Triangular alopecia (temporal alopecia, temporal triangular alopecia)
    Trichilemmal carcinoma
    Trichilemmal cyst (isthmus-catagen cyst, pilar cyst)
    Trichilemmoma
    Tricho–dento–osseous syndrome
    Tricho–rhino–phalangeal syndrome
    Trichoadenoma (trichoadenoma of Nikolowski)
    Trichoblastic fibroma
    Trichoblastoma
    Trichodiscoma
    Trichofolliculoma
    Trichomegaly
    Trichomycosis axillaris
    Trichorrhexis invaginata (bamboo hair)
    Trichorrhexis nodosa
    Trichostasis spinulosa
    Tropical acne
    Tropical ulcer (Aden ulcer, jungle rot, Malabar ulcer, tropical phagedena)
    Tuberous sclerosis (Bourneville disease, epiloia)
    Tubular carcinoma
    Tufted angioma (acquired tufted angioma, angioblastoma, angioblastoma of Nakagawa, hypertrophic hemangioma, progressive capillary hemangioma, tufted hemangioma)
    Tufted folliculitis
    Tularemia (deer fly fever, Ohara's disease, Pahvant Valley plague, rabbit fever)
    Tulip fingers
    Tumid lupus erythematosus (lupus erythematosus tumidus)
    Tumor alopecia
    Tumor lysis syndrome
    Turner syndrome
    Tuzun syndrome
    Twenty-nail dystrophy (sandpapered nails, trachyonychia)
    Two coalescing, red, scaly patches on the dorsal surface of an adult finger
    Ulceration and crusting over a skin lesion on the front of an adult nose
    Ullrich disease
    Ulnar–mammary syndrome
    Umbilical granuloma
    Uncombable hair syndrome (cheveux incoiffable, pili trianguli et canaliculi, spun-glass hair)
    Unilateral palmoplantar verrucous nevus
    Universal angiomatosis (generalized telangiectasia)
    Ureter and renal pelvis, transitional cell cancer
    Urethral cancer
    Urethral caruncle
    Urshiol-induced
    Urticaria pigmentosa
    Urticaria pigmentosa (childhood type of generalized eruption of cutaneous mastocytosis)
    Urticarial erythema multiforme
    Uterine sarcoma
    Uveal melanoma
    Vaginal cancer
    Van Der Woude syndrome
    Varicella
    Varicella (chickenpox)
    Variola major (smallpox)
    Vegetable-induced
    Venous lake
    Venous lake (phlebectasis)
    Verruca plana (flat wart)
    Verruca plantaris (plantar wart)
    Verruca vulgaris (wart)
    Verrucae palmares et plantares
    Verrucous carcinoma
    Verrucous cyst (cystic papilloma)
    Verrucous lupus erythematosus (hypertrophic lupus erythematosus)
    Verrucous perforating collagenoma
    Verrucous vascular malformation
    Verruga peruana
    Vesicular pemphigoid
    Vibrio vulnificus infection
    Viral keratosis
    Viral-associated trichodysplasia (ciclosporin-induced folliculodystrophy)
    Visual pathway and hypothalamic glioma
    Vitamin K reaction
    Von Hippel–Lindau syndrome
    Vulvar cancer
    Vulvar childhood pemphigoid
    Warfarin necrosis
    Warty dyskeratoma (isolated dyskeratosis follicularis)
    Wasting syndrome
    Watson syndrome
    Waxy keratosis of childhood (kerinokeratosis papulosa)
    Weber–Christian disease
    Werner syndrome (adult progeria)
    West Nile virus infection
    Westerhof syndrome
    Whistling syndrome (craniocarpotarsal syndrome, distal arthrogryposis type 2, Freeman–Sheldon syndrome, Windmill–Vane–Hand syndrome)
    Wildervanck syndrome
    Wilms tumor
    Wilson–Turner syndrome
    Winchester syndrome
    Wolf–Hirschhorn syndrome (4p- syndrome)
    Wooly hair nevus (woolly hair nevus)
    Wrinkly skin syndrome
    X-linked hypertrichosis
    X-linked ichthyosis
    X-linked ichthyosis (steroid sulfatase deficiency, X-linked recessive ichthyosis)
    X-linked recessive chondrodysplasia punctata
    Xanthelasmoidal mastocytosis
    Xeroderma pigmentosum
    Xeroderma pigmentosum (Cockayne syndrome complex)
    Xerotic eczema
    XXYY genotype
    Yaws
    Zimmermann–Laband syndrome
    Zoon's vulvitis
    Zoster (herpes zoster, shingles)
    Zoster sine herpete
    Zosteriform metastasis
    Zosteriform speckled lentiginous nevus
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