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Paper text:
a 40-year - old male , information technology professional by occupation came with complaints of asymptomatic skin lesions over the abdomen for past 2 months .
there was no history of abdominal pain , nor the usage of heating pads for abdomen .
the patient also had a habit of lying down and keeping the laptop on his abdomen . on examination
dermatological examination revealed multiple hyperpigmented reticulated patches with scaling in few areas over the anterior abdominal wall [ figure 1 ] .
thyroid profile was observed to be normal . on clinical grounds , a diagnosis of erythema ab igne was made .
erythema ab igne is a reticular erythematous pigmented dermatoses which occur due to prolonged or repeated exposure of skin to concentrated sub - threshold infrared radiation inadequate to cause burns .
the exact pathogenesis is not known , but it may be due to extravascular deposition of hemosiderin following damage to venous plexus . the pattern of pigmentation may simulate that of the venous plexus . in
the olden days erythema ab igne usually occurred following application of heat over the abdomen or over the back for abdominal pain due to underlying medical diseases like pancreatic pathology , carcinoma of kidney , etc .
, it can also occur over forearms , legs due to car heaters , stove and open fires .
rarely heating pads , recliners can also cause erythema ab igne . it may be rarely observed in hypothyroidism .
recently , there were reports of erythema ab igne following prolonged usage of laptop over the thighs and breast . in some patient 's microwave , ovens and mobile phones
clinically it is characterised by initial phase of erythema due to vasodilation that blanches on pressure .
this is followed by a brownish reticulated pigmentation that may later change to hyperpigmented network due to hemosiderin deposition and melanophages which may be permanent with atrophy in some cases .
if erythema ab igne occurs following heating for pain relief then , investigations should be done to rule out underlying pathology . rarely , this may lead on to squamous cell carcinoma .
lap top induced erythema ab igne is due to heat from the optical drive , battery and also due to occlusion of the cooling fan .
this heat can achieve an optimum temp of 50c due to to close an approximation with skin when kept over the thigh lead to erythema ab igne . in the literature , 93% of cases
the treatment modalities for erythema ab igne include topical tretinoin , hydroquinone for pigmentation and 5-fluorouracil if cellular atypia seen in histopathology .
erythema ab igne is reticular erythematous pigmented dermatoses seen in patients exposed to prolonged or repeated sub - threshold infrared radiation inadequate to cause burns . here 
 , we report a case of erythema ab igne in a 40-year - old male patient seen over the abdomen due to prolonged laptop use .