An 80-year-old man was referred by his cardiologist for assessment of an asymptomatic rash on his upper back. The rash had been present for 3 months. When questioned, the patient reported that he had used a rectangular, mid-sized heating pad on the upper back. He stated it worked better than pain pills. The diagnosis was determined to be erythema ab igne. The patient was advised to discontinue use of the heating pad.
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