Psoriasis is an autoimmune disease that causes raised, red, scaly patches to appear on the skin. It typically affects the outside of the elbows, knees, and scalp, though it can appear on any part of the body. Some people report that psoriasis is itchy, burns, and stings.

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If you develop a rash that doesn’t go away with an over-the-counter medication, you should contact your doctor.