Erythema ab igne is a skin
reaction caused by chronic exposure to heat (heated blankets, hot water
bottles, laptop computers).
The exposure to heat
results in higher temperatures in the skin (cutaneous hyperthermia) in
the range of 43-47°C. Because of this, the skin reacts with changes
that result in a red reaction resembling a fishing net pattern.
ab igne have malignant
Chronic repeated exposure
to heat may result in changes similar to those seen with repeated
ultraviolet radiation. Benign changes such as pigmentation changes and
keratosis may be seen. However, premalignant and malignant changes such
as squamous cell carcinoma in situ and true squamous cell carcinoma
have been reported in patients after chronic exposure to heat.
Cessation of chronic heat exposure is
the key in resolving erythema ab igne. In mildly affected skin the
condition may resolve within several months. In many cases, however,
skin changes persist after cessation of heat exposure.