Derm Dx: Widespread salmon-colored patches

A 68-year-old man is referred to a podiatry clinic for evaluation and treatment of a nail condition manifested as distal yellow-brown discoloration and dystrophy of all nails. The patient is a retired engineer who noticed a small erythematous patch on his chest 2 years ago. At present, much of his body, including his back, chest, arms, legs, and feet are ...