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Erythema ab igne (EAI) is a reticulated, maroon-to-brownish dermatosis that develops after repeated exposure to a heat source. Historically, it was observed on the lower legs of individuals exposed to chronic heat from open fires or coal stoves. It became less common after the advent of central heating. In modern times, the elderly or those with chronic pain may develop EAI after repeated use of heating pads. EAI from a laptop computer was first reported in 2004. Since then, it has been reported in 10 laptop users, including, recently, the youngest, a 12-year-old boy.
The authors of this new report reviewed all 10 cases. The typical location of the dermatosis was the anterior thigh, appearing after several months of laptop use at an average …