Psoriasis vulgaris is the most common form of psoriasis, accounting for 80–90% of all cases. Psoriasis vulgaris appears as plaques (broad, raised areas on the skin) with clearly defined edges and surrounding normal skin. The plaques are salmon pink or red, and are covered with white or silvery scales.
Distribution is usually symmetrical, with areas most commonly affected including the front of the knees and backs of the elbows, the lower back, around the umbilicus (belly button), and the scalp, where plaques rarely extend beyond the hairline.
For more information, see Psoriasis.
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