You are answering a USMLE-style medical question. Question: A 38-year-old woman comes to the physician because of a 1-month history of a painless, nonpruritic skin lesion on her right thigh. She initially thought it was an insect bite, but it has slowly increased in size over the past weeks. Her temperature is 36.7°C (98°F), pulse is 75/min, and blood pressure is 128/76 mm Hg. Physical examination shows a 0.8-cm hyperpigmented papule. When the skin lesion is squeezed, the surface retracts inwards. A photograph of the lesion is shown. Which of the following is the most likely diagnosis? Options: A) Dermatofibroma B) Cherry hemangioma C) Actinic keratosis D) Seborrheic keratosis Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.