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| Fig. 7.1 Psoriasis vulgaris. A, Numerous well-demarcated scaly plaques on the trunk. B, Close-up of elbow involvement demonstrating typical, well-demarcated, red plaques with silvery scale. (Panel A courtesy of the Fitzsimons Army Medical Center teaching files). |
Psoriasis is a common, genetically determined, inflammatory, and hyperproliferative skin disease. Although there are morphologic variations, the most characteristic lesions consist of chronic, well-demarcated, dull-red plaques (Fig. 7-1A) with silvery scale found commonly on extensor surfaces and the scalp (Fig. 7-1B).
