Review Question - QID 212335

A 65-year-old woman comes to the clinic for an annual well-check. Her past medical history includes diabetes and hypertension, which are well-controlled with metformin and losartan, respectively. The patient reports a healthy diet consisting of mainly vegetables and lean meat. She denies smoking or alcohol use. She enjoys taking walks with her husband and sunbathing. Physical examination is unremarkable expect for a rough, scaly, sand paper-like plaque on her left dorsal hand with no tenderness or pain. What is the most likely diagnosis?