A 53-year-old man presents to urgent care concerned about a spreading rash underneath his arms for the past 3 weeks. He initially thought it was an allergic reaction to a new deodorant, but the rash persisted after stopping the deodorant. The rash is not itchy. The patient has a history of type 2 diabetes. On examination, a broad, well-demarcated, thin, scaly plaque is seen extending from the lateral chest over the axilla to the upper …
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