causes of toasted skin syndrome
Erythema ab igne (EAI, also known as hot water bottle rash, fire stains, laptop thigh, granny's tartan and toasted skin syndrome) is a skin condition caused by long-term exposure to heat (infrared radiation).ifferent types of heat sources can cause this condition such as: 1  Repeated application of hot water bottles, heating blankets or heat pads to treat chronic painâe.g., chronic backache. 2  Repeated exposure to heated car seats, space heaters, or fireplaces.