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A healthy 69-year-old man with osteoarthritis of the knees presented with a 2-week history of mottled darkening of the skin on the left thigh. On examination, there was a reticular, reddish-brown, pruritic, nontender, macular, nonblanching discoloration around the medial aspect of his left knee, with a few superficial erosions. He had no fever, chills, or other constitutional symptoms. For several weeks before this event, the patient had applied a heating pad repeatedly to his left knee to relieve the discomfort from the osteoarthritis. The reticular, hyperpigmented erythema is a typical presentation of erythema ab igne, a phenomenon caused by chronic . . . [Full Text of this Article] |
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