Actinic keratosis

A 55-year-old man comes to the office for evaluation of scaliness and redness over his forehead for the past few months. It sometimes causes a stinging sensation on the affected area. Review of systems is noncontributory. He has been working as a lifeguard at the beach for the past 25 years. Past medical history is significant for type 2 diabetes mellitus that is well-controlled with metformin. Temperature is 37.0°C (98.6°F), pulse is 78/min, respirations are 16/min, and blood pressure is 126/75 mmHg. Physical examination reveals a sandpaper-like texture of the forehead on palpation. An image of the lesion is shown below:


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Which of the following is the most likely diagnosis?