MARTIN SHIELDS / SCIENCE PHOTO LIBRARY MARTIN SHIELDS / SCIENCE PHOTO LIBRARY
Close-up of plaque psoriasis (Psoriasis vulgaris) on an elbow. About 80 percent of those afflicted by psoriasis have plaque psoriasis. It is characterised by raised, inflamed, red lesions covered by a silvery white scale. It is typically found on elbows, knees, the scalp and the lower back.
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