Psoriasis shows up as sharply defined red, scaly patches on the skin. It may come on at any age but is usually linked to some family history of the same condition. The most commonly affected regions are the elbows, knees, and scalp, though it can occur anywhere.
Psoriasis is treated with topical steroids, topical tar, and topical Vitamin D ointments and creams. In some extreme cases, a laser or ultraviolet light therapy may be used in addition to the topical and oral medications.