54 yo black diabetic male presents to wound clinic with rec | Figure 1

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54 yo black diabetic male presents to wound clinic with recurrent bullous lesions to bilateral lower extremities. Lesions spontaneously occur, rupture, then crust over. Denies pain; hx of paraplegia. I suspect this may be bullous diabeticorum. Treated him with a course of clindamycin, prednisone, and silvadene. Also referred to dermatology. Any ideas what this may be? Concerned because lesions occur over saphenous vein. Maybe vasculitis?

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