DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Plaque psoriasis. Close-up of dry scaly lesions on the skin of a 68-year-old male patient with plaque psoriasis. Psoriasis is an autoimmune disease characterised by patches of abnormal skin. There are five main types of psoriasis: plaque, guttate, inverse, pustular, and erythrodermic. Plaque psoriasis (seen here) causes red patches with scales on top.
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