A 67-year-old man visits urgent care for a lesion on his right ankle that was first noticed 25 years ago. He reports that it has progressively grown larger over the past 6 months. The lesion is painless but is intermittently mildly pruritic. The patient denies any recent injury or past medical history besides chronic venous insufficiency. On dermatologic examination, a discrete dark brown plaque is noted posterior to the lateral malleolus with numerous surrounding spider …
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