A 52-year-old man requests removal of a growth at the base of his thumb. The lesion was first noted approximately 18 months ago and has been slowly enlarging. The lesion is subject to repeated trauma and is at times tender. Examination reveals a firm fixed flesh-colored nodule measuring 1.2 cm. No similar-appearing growths are noted elsewhere. The patient is in good health and denies history of arthritis and gout.
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