Plaque PsoriasisPlaque psoriasis - this is the most common form of psoriasis. Characteristically the plaques occur on the extensor surfaces of the knees and elbows. The lesions tend to be discoid or coin shaped. The size may vary from one to several centimetres. Other common sites involved are the scalp, particularly behind the ears, and the sacral region. The face is an uncommon site to be involved. |