This isolated white lesion was innocuously present for many years before it began to bother him, and the man has no other informative symptoms to report. What do you make of it?
A 70-year-old man sought medical attention for a white lesion with surrounding erythema on the thumb of his right hand. The lesion had been present for many years and had recently become inflamed and painful. He had no other symptoms. No other areas were affected. His medical history was unremarkable, and he was not taking any medications.