Review Question - QID 210481

A 20-year-old student has an appointment with his primary care physician for an annual check-up. He is in his usual state of health. His sophomore year of college went well, and he’s currently been home working as a lifeguard for the summer. He asks about good sunscreen to prevent his “sun spots.” Every summer for the last 2 years he has developed an “uneven” rash that sometimes is itchy but is otherwise asymptomatic. The rash never bothered him until recently when his friends and other pool attendees started asking if he was "peeling from a bad sunburn." His medical history is significant for well-controlled type 1 diabetes mellitus. He is currently on insulin. His temperature is 98.6°F (37°C), blood pressure is 110/60 mmHg, pulse is 80/min, and respirations are 11/min. Physical examination shows cutaneous lesions on the chest and upper extremities, which are depicted in Figure A. Which of the following is the most likely diagnosis?