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A chronic skin disease characterized by small follicular papules, disseminated reddish-brown scaly patches, and often, palmoplantar hyperkeratosis. T…

A heritable disorder of faulty keratinization characterized by the proliferation of abnormal clones of KERATINOCYTES and lesions showing varying atro…

An autosomal recessive porphyria that is due to a deficiency of UROPORPHYRINOGEN III SYNTHASE in the BONE MARROW; also known as congenital erythropoi…

A vascular malformation of developmental origin characterized pathologically by ectasia of superficial dermal capillaries, and clinically by persiste…

A condition characterized by a broad range of progressive disorders ranging from TENOSYNOVITIS to tendon rupture with or without hindfoot collapse to…

An ulceration caused by prolonged pressure on the SKIN and TISSUES when one stays in one position for a long period of time, such as lying in bed. Th…

Rare autosomal recessive disorder of metabolism due to mutations in the prolidase gene. It is characterized by recurrent lower extremity skin ulcers,…

A name applied to several itchy skin eruptions of unknown cause. The characteristic course is the formation of a dome-shaped papule with a small tran…

Primarily a patient-reported sensation, complaint or symptom rather than a disease entity.

A common genetically determined, chronic, inflammatory skin disease characterized by rounded erythematous, dry, scaling patches. The lesions have a p…

Any purulent skin disease (Dorland, 27th ed).

An idiopathic, rapidly evolving, and severely debilitating disease occurring most commonly in association with chronic ulcerative colitis. It is char…

A cutaneous inflammatory reaction occurring as a result of exposure to ionizing radiation.

A manifestation of severe ROSACEA resulting in significant enlargement of the NOSE and occurring primarily in men. It is caused by hypertrophy of the…

A cutaneous disorder primarily of convexities of the central part of the FACE, such as FOREHEAD; CHEEK; NOSE; and CHIN. It is characterized by FLUSHI…

Skin diseases involving the SCALP.

A diffuse, non-pitting induration of the skin of unknown etiology that occurs most commonly in association with diabetes mellitus, predominantly in f…

A connective tissue disorder characterized by widespread thickening of SKIN with a cobblestone-like appearance. It is caused by proliferation of FIBR…

Diseases of the sebaceous glands such as sebaceous hyperplasia and sebaceous cell carcinoma (SEBACEOUS GLAND NEOPLASMS).

Congenital structural abnormalities of the skin.

A collective term for diseases of the skin and its appendages and of connective tissue.

Diseases involving the DERMIS or EPIDERMIS.

Any of a variety of eruptive skin disorders characterized by erythema, oozing, vesiculation, and scaling. Etiology is varied.

Diseases of the skin associated with underlying metabolic disorders.

A group of dermatoses with distinct morphologic features. The primary lesion is most commonly a papule, usually erythematous, with a variable degree …

Skin diseases affecting or involving the cutaneous blood vessels and generally manifested as inflammation, swelling, erythema, or necrosis in the aff…

Skin diseases characterized by local or general distributions of blisters. They are classified according to the site and mode of blister formation. L…

An ULCER of the skin and underlying tissues.

A disorder characterized by multiple, wide spread cutaneous cysts that often become inflamed and rupture. It is caused by the same mutations in the g…

An injury to the skin causing erythema, tenderness, and sometimes blistering and resulting from excessive exposure to the sun. The reaction is produc…