There are a few types of psoriasis. While some are similar, they can have different symptoms and treatments. Each type affects a different area of your body. Knowing which kind of, Plaque psoriasis (psoriasis vulgaris) is a long-lasting (chronic) autoimmune disease that causes your cells to reproduce very quickly. It’s a type of psoriasis that causes thick, scaly patches called plaques on your skin., Psoriasis is a skin disease that causes a rash with itchy, scaly patches, most commonly on the knees, elbows, trunk and scalp. Psoriasis is a common, long-term (chronic) disease with no cure. It can be painful, interfere with sleep and make it hard to concentrate., Psoriasis is the most prevalent immune-mediated inflammatory disease. It involves skin and in some cases, joints, and can be associated with abnormalities of other systems. Plaque psoriasis is the most common type of psoriasis., Chronic plaque psoriasis, the most common presentation of psoriasis, typically presents with inflamed, well-demarcated plaques (picture 1A-H). Overlying coarse scale is usually present with the exception of plaques in intertriginous areas., .