Erythema ab igne

Erythema ab igne is a rash of the skin, which is usually caused by the long-term exposure to heat or infrared radiation,^[1] and which is not a burn. Usually the name is abbreviated EAI. Other names include hot water bottle rash^[2] fire stains,^[3] laptop thigh, granny's tartan and toasted skin syndrome.^[3]

Erythema ab igne
Classification and external resources
Erythema ab igne in a person with chronic abdominal pain who found some relief from the application of heat.
ICD-10	L59.0
ICD-9	692.82
DiseasesDB	4438
eMedicine	derm/130

Some people may complain of mild itchiness and a burning sensation. When a change in skin pigmentation can not be seen, it is often not noticed at all.