Psoriasis

A non-contagious rash of thick red plaques covered with white or silvery scales, psoriasis usually affects the scalp, elbows, knees, and lower back. The rash can heal and recur throughout life. The cause of psoriasis is unknown, but the immune system triggers new skin cells to develop too quickly. Treatments include medications applied to the skin, light therapy, and medications taken by mouth, injection or infusion.