toasted skin syndrome
n. A skin rash caused by lengthy exposure to a heat source, such as laptop computer balanced on the thighs for an extended period.
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Balancing your laptop on your knees could cause permanent discolouration of the skin and, in rare cases, cancer, doctors have warned. The heat generated by the computers can cause a nettle sting-like rash — a condition named 'toasted skin syndrome'.
—Fiona MacRae, “How the heat from a laptop can 'toast' the skin on your thighs,” Daily Mail, October 05, 2010
Have you ever worked on your laptop computer with it sitting on your lap, heating up your legs? If so, you might want to rethink that habit. Doing it a lot can lead to "toasted skin syndrome," an unusual-looking mottled skin condition caused by long-term heat exposure, according to medical reports.
—Lindsey Tanner, “Warm laptop can cause 'toasted skin syndrome',” Orlando Sentinel, October 04, 2010
1981 (earliest)
Erythema Ab Igne: "Toasted Skin" syndrome This condition occurs most commonly in women past middle age.
—M. H. Samitz, Cutaneous Disorders of the Lower Extremities, Lippincott Williams & Wilkins, June 01, 1981
Toasted skin syndrome is also called laptop thigh, and in the medical literature it's known as erythema ab igne (literally, "redness caused by fire").