Plaque psoriasis is a skin disorder that is common to people who have psoriasis. This causes a change in the skin that looks like a scaly or silvery plaque or patch surrounded by a reddened border. This skin change is not contagious or infectious, it is caused by an autoimmune reaction in the skin. The plaques are often found on the elbows or knees, the back or the neck.
The skin lesions of plaque psoriasis are treatable. They may respond to topical steroids, vitamin D, UV light or sunlight, or medicines that suppress the immune system.