Derm Dx: A large lesion on the thumb

A 74-year-old woman presents for treatment of a bothersome lesion on her thumb. She reports a history of arthritis. The lesion is frequently traumatized when doing housecleaning and cooking. A flesh-colored, semitranslucent nodule is noted between the proximal nailfold and the distal interphalangeal joint. No other fingers or toes are similarly affected.