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Man's Painful Leg Pustule May Soon Burst - Can You Diagnose?

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A 55-year-old man with a history of inflammatory bowel disease reported a very painful, deep-seated pustule on his leg that looked like it might eventually rupture. He also had a fever and some arthralgia, but he wasn't sure if they were related.

Is it pyoderma gangrenosum, cellulitis, a CA-MRSA skin infection, or furunculosis?

Check out our differential in VisualDx.

The correct diagnosis is...

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