What is Psoriasis?
Psoriasis is a very common immune-mediated inflammatory disease of the skin that occurs in about 3 percent of the population. It causes the body to make new cells in days, rather than weeks. As these cells pile up on the surface of your skin, they produce red, scaly plaques with thickened skin. While psoriasis can occur on all areas of the body, it is particularly common on elbows, knees, the scalp, the lower back and the umbilicus.