An 85-year-old wheelchair-bound man presented for evaluation of a solitary round plaque on his right temple. The lesion measured approximately 3.5 cm in diameter. He was unsure how long it had been present. There was no pain or pruritus. The man had tried treating the plaque with hydrocortisone 1% cream, to no avail. He had no similar lesions, although he did have numerous actinic keratoses.
The patient, a 50-year-old man, was concerned about four 2- to 4-cm edematous plaques on his face and neck. The lesions, which had first appeared several months earlier, came and went intermittently. There was no pain or pruritus, and the lesions did not bleed or weep. The patient thought the plaques might be related to sun exposure. He had no other similar lesions.
What is the diagnosis?
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