system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 68-year-old man comes to the physician because of a 3-month history of a painless skin lesion on his neck. The lesion has gradually become darker in color. Sometimes it is itchy. He also noticed one similar lesion on his lower back. He is a retired gardener. He has smoked half a pack of cigarettes daily for 40 years. His temperature is 36.7°C (98°F), pulse is 72/min, and blood pressure is 123/78 mm Hg. Physical examination shows a 0.8-cm hyperpigmented papule on his neck and a 0.6-cm hyperpigmented papule on his lower back, both of which have a greasy and wax-like appearance. A photograph of the neck is shown. Which of the following is the most likely diagnosis?
assistant
Seborrheic keratosis