Erythema ab igne (EAI) is a skin reaction caused by exposure to heat. It was once commonly seen in the elderly who stood or sat closely to open fires or electric heaters, but wide use of Central Heating has reduced the incidence.It is still sometimes found in people exposed to heat from other sources like heat packs, laptops, and hot water bottles. Overexposure to heat causes a mild red rash that might be described as 'blotchy'. Prolonged and repeated exposure causes a marked redness and colouring of the skin.
