A 52-year-old man with diabetes reported a 3-month history of a pretibial rash during a routine visit. He had a 15-year history of type 2 diabetes mellitus treated with insulin and a 3-year history of congestive heart failure. The lesions had begun to ulcerate and bleed but were not pruritic or painful.

Physical examination showed yellow–brown plaques with ulcerations and telangiectases in the thinned epidermis. What could be the possible diagnosis in this case? *This case is from Docplexus Editorial Team for educative purpose only.