Psoriasis (suh-RIE-uh-sis) is the rapid buildup of rough, scaly skin. The extra skin cells form thick, gray or silvery scales, and itchy sometimes painful patches. Psoriasis often occurs on the lower back, soles of the feet, knee, face, elbows (A) or scalp (B). The rash might be red or purple, which might be difficult to see on Black or brown skin.
The condition tends to flare up periodically. Common triggers in people with a genetic predisposition to psoriasis include infections, cuts or burns, certain medications, and stress.
For some people, psoriasis is a mild nuisance. For others, it can be disabling, affecting large areas of skin for a long time. Signs and symptoms might be eased by moisturizing, avoiding triggers, and seeking medical treatment, such as prescription creams and light therapy.