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A common chronic disease of the skin consisting of red elevated areas on the skin which coalesce to form plaques with distinct borders. As the disease progresses and if it is untreated, a silvery, yellow-white scale develops. New lesions tend to appear at sites of trauma; they may appear in any location but frequently are on the scalp, knees, elbows, umbilicus and genitalia.
Taxonomy Code: YF-3000.2110-650