Is deodorant causing this man’s underarm rash? Let’s diagnose.

A 53-year-old man visited his doctor 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 it wasn’t itchy, and it persisted after stopping the deodorant. The patient had a history of type 2 diabetes. On examination, a broad, well-demarcated, thin, scaly plaque was seen extending from the lateral chest over the axilla to the upper arm.

What’s the diagnosis?

Use the Differential Builder in VisualDx to help you.

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