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A 56-year-old woman with a history of diabetes presents with discolored darkening skin on her toe that she has had for the past several months. She reports that she first noticed a dark spot on her foot after accidentally dropping a heavy box on her toes during a move. She states that the process has spread, and she occasionally experiences crusting and spontaneous bleeding. She has no other symptoms. She tried over-the-counter topical antifungals without improvement.

What is the diagnosis?
A. Atypical fungal infection
B. Atypical mycobacterial infection
C. Vasculitis
D. Acral melanoma
E. Dry gangrene

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