The well-demarcated erythematous plaques and papules with silvery white scales are characteristic of psoriasis. Removal of the scale typically reveals pinpoint-bleeding areas referred to as the Auspitz sign. There is a hereditary predilection for the condition and it often begins in the second or third decade of life.
Lesions tend to be symmetric and are most commonly found on the trunk, scalp, nails (A), and extensor surfaces (C). Systemic steroids (D) should be avoided due to the risk of developing rebound or induction of pustular psoriasis.
Hess MR, Hess SP: Skin Disorders Common on the Trunck, in Tintinalli JE, Kelen GD, Stapczynski JS (eds): Emergency Medicine, A Comprehensive Study Guide, ed 7. New York, McGraw-Hill, 2011, (Ch) 249:p 1653-1654.