What is Psoriasis?

Psoriasis is a chronic skin condition that causes skin cells to grow too quickly, resulting in thick, white, or red patches of skin. The patches range in size from small to large and typically occur on the knees, elbows, scalp, hands, feet, or lower back. Psoriasis is most common in adults, although children and teens may be affected.
Normally, skin cells mature gradually and are shed about every 28 days. New skin cells replace outer layers of the skin surface that are shed or sloughed off during normal daily activity. In psoriasis, skin cells do not mature but instead move rapidly up to the surface of the skin over 3 to 6 days and build up, forming the characteristic patches (plaques).