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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).〔(【引用サイトリンク】title=Riahi RR, Cohen PR, Robinson FW, Gray JM. Erythema ab igne mimicking livedo reticularis )〕 Prolonged thermal radiation exposure to the skin can lead to the development of reticulated erythema, hyperpigmentation, scaling and telangiectasias in the affected area. Some people may complain of mild itchiness and a burning sensation, but often, unless a change in pigmentation is seen, it can go unnoticed. ==Causes== Different types of heat sources can cause this condition such as: * Repeated application of hot water bottles, heating blankets or heat pads to treat chronic pain—e.g., chronic backache.〔 * Repeated exposure to heated car seats, space heaters, or fireplaces. Repeated or prolonged exposure to a heater is a common cause of this condition in elderly individuals. * Occupational hazards of silversmiths and jewellers (face exposed to heat), bakers and chefs (arms) * Resting a laptop computer on the thigh (laptop computer-induced erythema ab igne). In a 2012 review, Riahi and Cohen describe the characteristics of laptop computer-induced erythema ab igne.〔 Temperatures between 43-47°C can cause this skin condition; modern laptops can generate temperatures in this range. Indeed, laptops with powerful processors can reach temperatures of 50°C and be associated with burns. Positioning of the laptop on the thighs can allow for direct exposure to the heating elements of the laptop, which include the central processing unit (CPU) and the graphics processing unit (GPU).〔 At least 15 cases have been reported by 2012 with the condition usually affecting the left anterior thigh. In these reports, 9 of the 15 patients were women (60%) with an average age of 25 years at diagnosis. * In Kashmir, due to the use of a kanger which also causes kangri cancer * It is a classic finding in chronic pancreatitis and may also be seen in people with hypothyroidism or lymphoedema 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Erythema ab igne」の詳細全文を読む スポンサード リンク
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