ABSTRACT
This is the commonest form of psoriasis, and is the type seen in approximately 90% of patients. Plaque psoriasis is the usual form of presentation in adults. The lesions vary in number from one to several (Figures 31-36) and in size from 0.5 to 30 cm or more (Figures 32-38). If the disease is active, the plaques will merge to form large confluent areas of psoriasis (Figures 39-43). The commonest sites for psoriasis are the extensor surfaces of the elbows
(Figures 27 and 28), knees (Figures 29 and 30) and scalp, but the skin on any part of the body may be involved, either with or without lesions elsewhere. Another common site is over the sacrum (Figures 44 and 45). The face is the site least likely to be involved. The disease presents as symmetrical welldemarcated red scaly plaques (Figures 27-30).
