DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Psoriasis of the scalp. Close-up of dry skin on the scalp of a 43-year-old female patient with 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.
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