Derm Dx: Erythematous, Scaly Scalp Lesions

A 49-year-old man presents to the clinic with a 2-year history of lesions on his scalp. The lesions began as scaly, red spots that slowly expanded to cover his scalp. He still gets new spots, and he noticed that the older lesions eventually fade and stop growing. He loses hair wherever the lesions appear. On examination, multiple erythematous, indurated, coalescing ...