If you have psoriasis, then you know how uncomfortable this skin condition can be. Psoriasis causes skin cells to grow ten times faster than usual, which results in red patches covered with white scales on the skin. Though it is not contagious, the unsightly red patches on the skin can be itchy and unsightly. Psoriasis can be present anywhere on the body, though it is most often found on the elbows, lower back, scalp, and knees. Unfortunately, the cause of psoriasis is mostly still unknown.