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Course: Erythematous Plaque on the Lower Extremity of an Older Adult Man

CME Credits: 1.00

Released: 2022-06-29

An otherwise healthy man in his early 70s presented to the Department of Dermatology with a 2-year history of a mildly pruritic, erythematous, and gradually enlarging lesion on the proximal portion of his left calf. The lesion had appeared without an identifiable cause, and for the previous 2 months, the patient had applied topical corticosteroids and antifungals with no improvement. Physical examination revealed an ill-defined, nonindurated, erythematous-violaceous plaque that was slightly raised but with an atrophic appearance (, A). A skin biopsy was obtained for histopathology examination (, B-D).


Educational Objective
Based on this clinical scenario and the accompanying image, understand how to arrive at a correct diagnosis.


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