Diffuse, Erythematous, Scaly Eruption.

Previously published Photo Quizzes are now featured in a mobile app. Get more information at http:// www.aafp.org/afp/apps. A 52-year-old male smoker presented with a mildly pruritic rash that began three months earlier on his back and spread to his scalp, trunk, and extremities, including the palms and soles. He had a history of alcoholic cirrhosis. He had no recent new exposures, including medications. Physical examination revealed numerous well-circumscribed, erythematous, nonblanching plaques with adherent white scale involving approximately 70% of his body (Figures 1 and 2). His palms and soles displayed thick scale with fissures, and he had oil spots and onycholysis affecting several fingernails. Question