psoriasis

n. chronic skin disease characterized by scaly red patches on the skin

Psoriasis (IPA pronunciation: ) is a disease which affects the skin and joints. It commonly causes red scaly patches to appear on the skin. The scaly patches caused by psoriasis, called psoriatic plaques, are areas of inflammation and excessive skin production. Skin rapidly accumulates at these sites and takes a silvery-white appearance. Plaques frequently occur on the skin of the elbows and knees, but can affect any area including the scalp and genitals. Psoriasis is hypothesized to be immune-mediated and is not contagious.
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Named for the Greek word psora meaning "itch," psoriasis is a chronic, non-contagious disease [more]Psoriasis - Community and Resources

Noun
1. a chronic skin disease characterized by dry red patches covered with scales; occurs especially on the scalp and ears and genitalia and the skin over bony prominences
(hypernym) skin disease, disease of the skin, skin disorder, skin problem, skin condition
(part-meronym) acanthosis

n. psora, psoriasis, chronic skin disease characterized by scaly red patches on the skin, scabies, infestation of body lice (Medicine)