A Visual Guide to Psoriasis![]() This skin condition causes a thick, patchy, red rash with silvery, white scales. The most common type is called plaque psoriasis. You can get it anywhere, but it shows up most often on your scalp, elbows, knees, and lower back. You can't catch it by touching the skin of someone who's got it. Kids can get psoriasis, but it's more common in adults. |