Skin

Acanthosis nigricans is a cutaneous finding characterized by brown-to-black, velvety…

Acne, also known as acne vulgaris, is a long-term skin condition that occurs when dead…

Albinism is the congenital absence of pigmentation in an animal or plant resulting in…

Arsenic poisoning is a medical condition that occurs due to elevated levels of arsenic in…

A boil, also called a furuncle, is a deep folliculitis, which is an infection of the hair…

Cellulitis is usually a bacterial infection involving the inner layers of the skin. It…

Cutaneous larva migrans is a skin disease in humans, caused by the larvae of various…

Dermatosis papulosa nigra (DPN) is a condition of many small, benign skin lesions…

Granuloma inguinale is a bacterial disease caused by Klebsiella granulomatis…

Dermatophytosis, also known as tinea and ringworm, is a fungal infection of the skin,…

Impetigo is a contagious bacterial infection that involves the superficial skin. The most…

Keloid, also known as keloid disorder and keloidal scar, is the formation of a type of…

Leprosy, also known as Hansen's disease (HD), is a long-term infection by the bacterium…

Mycetoma is a chronic infection in the skin caused by either bacteria (actinomycetoma) or…

Melasma is a common skin disorder characterized by tan, brown, or grayish hyperpigmented…

A Mongolian spot, also known as a slate grey nevus or congenital dermal melanocytosis, is…

Pemphigus vulgaris is a rare chronic blistering skin disease and the most common form of…

Miliaria, commonly known as heat rash, sweat rash, or prickly heat, is a skin disease…

Scabies is a contagious human skin infestation by the tiny (0.2–0.45 mm) mite Sarcoptes…

Stevens–Johnson syndrome (SJS) is a type of severe skin reaction. Together with toxic…

Tinea versicolor is a condition characterized by a skin eruption on the trunk and…

Vitiligo is a chronic autoimmune disorder that causes patches of skin to lose pigment or…

Acne keloidalis nuchae (AKN), is a destructive scarring folliculitis that occurs most…

Acrodermatitis enteropathica is an autosomal recessive metabolic disorder affecting the…

Actinic keratosis (AK), sometimes called solar keratosis or senile keratosis, is a…

Alopecia areata (AA), also known as spot baldness, is a condition in which hair is lost…

Angiokeratoma is a benign cutaneous lesion of capillaries, resulting in small marks of…

Erythema dyschromicum perstans is an uncommon skin condition with peak age of onset being…

Athlete's foot, known medically as tinea pedis, is a common skin infection of the feet…

Basal-cell carcinoma (BCC), also known as basal-cell cancer, basalioma, or rodent ulcer,…

Becker's nevus is a benign skin disorder predominantly affecting males. The nevus can be…

Bloom syndrome is a rare autosomal recessive genetic disorder characterized by short…

Cutaneous squamous-cell carcinoma (cSCC), also known as squamous-cell carcinoma of the…

Bullous pemphigoid is an autoimmune pruritic skin disease that typically occurs in people…

Cockayne syndrome (CS), also called Neill-Dingwall syndrome, is a rare and fatal…

Contact dermatitis is a type of acute or chronic inflammation of the skin caused by…

Cutaneous horns, also known by the Latin name cornu cutaneum, are unusual keratinous skin…

Cutis laxa or pachydermatocele is a group of rare connective tissue disorders in which…

Darier's disease is a rare, genetic skin disorder. It is an autosomal dominant disorder,…

Dermatitis herpetiformis (DH) is a chronic autoimmune blistering skin condition,…

A dermatofibroma, or benign fibrous histiocytomas, is a benign nodule in the skin,…

Dermatofibrosarcoma protuberans (DFSP) is a rare locally aggressive malignant cutaneous…

Discoid lupus erythematosus is the most common type of chronic cutaneous lupus (CCLE), an…

A dysplastic nevus or atypical mole is a nevus (mole) whose appearance is different from…

Poromas are rare, benign, cutaneous adnexal tumors. Cutaneous adnexal tumors are a group…

Ectodermal dysplasia (ED) refers to a group of genetic disorders characterized by the…

Dermatitis is a term used for different types of skin inflammation, typically…

Ehlers–Danlos syndromes (EDS) are a group of 13 genetic connective tissue disorders.…

Epidermodysplasia verruciformis (EV) is a skin condition characterised by warty skin…

An epidermoid cyst or epidermal inclusion cyst is a benign cyst usually found on the…

Epidermolysis bullosa (EB) is a group of rare medical conditions that result in easy…

Erysipelas is a relatively common bacterial infection of the superficial layer of the…

Erythema multiforme (EM) is an immune-mediated inflammatory skin condition associated…

Erythema nodosum (EN) is an inflammatory condition characterized by inflammation of…

Erythrasma is a superficial skin infection that causes brown, scaly skin patches. It is…

Erythroderma is an inflammatory skin disease with redness and scaling that affects nearly…

Focal dermal hypoplasia is a form of ectodermal dysplasia. It is a multisystem disorder…

A glomus tumor is a rare neoplasm arising from the glomus body and mainly found under the…

Granuloma annulare (GA) is a rare, sometimes chronic skin condition which presents as…

Granuloma faciale is an uncommon benign chronic skin disease of unknown origin…

Hailey–Hailey disease (HHD), or familial benign chronic pemphigus or familial benign…

Hand, foot, and mouth disease (HFMD) is a common infection caused by a group of…

Harlequin-type ichthyosis is a genetic disorder that results in thickened skin over…

Hidradenitis suppurativa (HS), sometimes known as acne inversa or Verneuil's disease, is…

Hives, also known as urticaria, is a kind of skin rash with red or flesh-colored, raised,…

Hyperhidrosis is a medical condition in which a person exhibits excessive sweating, more…

Ichthyosis is a family of genetic skin disorders characterized by dry, thickened, scaly…

Incontinentia pigmenti (IP) is a rare X-linked dominant genetic disorder that affects the…

Kaposi's sarcoma (KS) is a type of cancer that can form masses on the skin, in lymph…

Keratitis–ichthyosis–deafness syndrome, also known as ichthyosiform erythroderma, corneal…

Keratoacanthoma (KA) is a common low-grade rapidly-growing skin tumour that is believed…

Keratosis pilaris is a common, autosomal-dominant, genetic condition of the skin's hair…

A lentigo is a small pigmented spot on the skin with a clearly defined edge, surrounded…

Lentigo maligna is where melanocyte cells have become malignant and grow continuously…

Lichen nitidus is a chronic inflammatory disease of unknown cause characterized by 1–2…

Lichen planus (LP) is a chronic inflammatory and autoimmune disease that affects the…

Lichen simplex chronicus (LSC) is thick leathery skin with exaggerated skin markings…

Lichen striatus is a rare skin condition that is seen primarily in children, most…

Lipodermatosclerosis is a skin and connective tissue disease. It is a form of lower…

A lipoma is a benign tumor made of fat tissue. They are generally soft to the touch,…

Merkel cell carcinoma (MCC) is an aggressive skin cancer occurring in about three…

Molluscum contagiosum (MC), sometimes called water warts, is a viral infection of the…

Methicillin-resistant Staphylococcus aureus (MRSA) is a group of Staphylococcus aureus…

Mucous membrane pemphigoid is a rare chronic autoimmune subepithelial blistering disease…

Mycosis fungoides, also known as Alibert-Bazin syndrome or granuloma fungoides, is the…

Onychomycosis, also known as tinea unguium, is a fungal infection of the nail. Symptoms…

Necrobiosis Lipoidica is a rare, chronic skin condition predominantly associated with…

Necrotizing fasciitis (NF), also known as flesh-eating disease or flesh-eating bacteria,…

Netherton syndrome is a severe, autosomal recessive genetic disorder associated with…

Nevus sebaceus or sebaceous nevus is a congenital, hairless plaque that typically occurs…

Nummular dermatitis is one of the many forms of dermatitis. It is characterized by round…

Pachyonychia congenita is a rare group of autosomal dominant skin disorders that are…

Papillon–Lefèvre syndrome (PLS), also known as palmoplantar keratoderma with…

Pemphigus foliaceus is an autoimmune blistering disease of the skin. It causes a…

Perioral dermatitis, also known as periorificial dermatitis, is a common type of…

Pilomatricoma is a benign skin tumor derived from the hair matrix. These neoplasms are…

Pityriasis lichenoides represents a distinct subset of inflammatory skin disorders that…

Pityriasis rosea is a type of skin rash. Classically, it begins with a single red and…

Pityriasis rubra pilaris refers to a group of chronic disorders characterized by reddish…

Porokeratosis is a specific disorder of keratinization that is characterized…

Pressure ulcers, also known as pressure sores, bed sores or pressure injuries, are…

Pretibial myxedema is an infiltrative dermopathy, resulting as a rare complication of…

Progeria is a type of progeroid syndrome. A single gene mutation is responsible for…

Prurigo nodularis (PN) is a chronic, inflammatory skin disease characterized by intense…

Pseudoxanthoma elasticum (PXE) is a genetic disease that causes mineralization of elastic…

Psoriasis is a long-lasting, noncontagious autoimmune disease characterized by patches of…

Pyoderma gangrenosum is a rare, inflammatory skin disease where painful pustules or…

A pyogenic granuloma or lobular capillary hemangioma is a vascular tumor that occurs on…

Restrictive dermopathy (RD) is a rare, lethal autosomal recessive skin condition…

Rosacea is a long-term skin condition that typically affects the face. It results in…

A sebaceous cyst is a term commonly used to refer to either:Epidermoid cysts Pilar cysts

Sebaceous hyperplasia is a disorder of the sebaceous glands in which they become…

Seborrhoeic dermatitis is a long-term skin disorder. Symptoms include flaky, scaly,…

Shingles, also known as herpes zoster or zona, is a viral disease characterized by a…

Melanoma is a type of cancer, typically skin cancer; it develops from the…

A skin tag, or acrochordon, is a small benign tumor that forms primarily in areas where…

A Spitz nevus is a benign skin lesion. A type of melanocytic nevus, it affects the…

Sporotrichosis, also known as rose handler's disease, is a fungal infection that may be…

Cutaneous squamous-cell carcinoma (cSCC), also known as squamous-cell carcinoma of the…

Stasis dermatitis refers to the skin changes that occur in the leg as a result of…

Sweet syndrome (SS), or acute febrile neutrophilic dermatosis, is a skin disease…

Syringomas are benign eccrine sweat duct tumors, typically found clustered on eyelids,…

A trichilemmal cyst is a common cyst that forms from a hair follicle, most often on the…

Trichoepithelioma is a neoplasm of the adnexa of the skin. Its appearance is similar to…

Urbach–Wiethe disease is a very rare recessive genetic disorder, with approximately 400…

Urticaria pigmentosa is the most common form of cutaneous mastocytosis.

Warts are non-cancerous viral growths usually occurring on the hands and feet but which…

Werner syndrome is a rare autosomal recessive disorder which is characterized by the…

Xeroderma pigmentosum (XP) is a genetic disorder in which there is a decreased ability to…