Psoriasis is a common, noninfectious skin condition. The most common type of psoriasis is plaque psoriasis. It causes the skin cells to develop much more rapidly than normal and not fall off like they should. The cells build up on your skin’s surface, causing areas of thick, silvery red skin called plaques. Plaques are usually itchy and covered with thick whitish-silvery scales. An overactive immune system is to blame for this process. Psoriasis in Children: Symptoms, Treatments, and More | Understanding Psoriasis in Children Learn More: • Psoriasis