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Find information on medical topics, symptoms, drugs, procedures, news and more, written in everyday language.

* This is the Consumer Version. *

Introduction to Psoriasis and Scaling Diseases

By Peter C. Schalock, MD

Psoriasis (see Psoriasis), pityriasis rosea (see Pityriasis Rosea), lichen planus (see Lichen Planus), and lichen sclerosus (see Lichen Sclerosus) are different skin disorders that have been grouped together because the bumps, rashes, scales, and skin discoloration they cause have similar characteristics. That is, the rashes and bumps have well-defined borders, and the scales usually do not crust, crack, or weep with fluid.

Doctors tell these disorders apart by examining the bumps, rashes, scales, and skin discoloration and noting where they appear on the skin.

* This is the Consumer Version. *