Psoriasis may appear in several different ways on the skin.
Plaque psoriasis is the most common type of psoriasis.
The elbows, knees, scalp, and groin are commonly affected but usually not the face. Generalized psoriasis may involve almost the entire skin surface. Erythrodermic psoriasis may occur after severe sunburn or the use of oral corticosteroids, a medication that is used for the treatment of inflammation. People with erythrodermic psoriasis have widespread redness and scaling of the skin, and itching or pain is also common. Pustular psoriasis is much rarer.