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Patient with erythematous lesion on thenar eminence

A 75-year-old woman visited our department in 2014 with an asymptomatic, well-circumscribed, round to oval erythematous lesion on her left thenar eminence. It was 1.5 cm in diameter and was a depressed atrophic patch with slightly elevated scaling border (Fig. 1). The lesion had been noticed three years previously and had remained relatively stable in size during this period. Any history of trauma, burns, or exposure to chemical agents was