Laptop computer--associated erythema ab igne.

A 40-year-old woman presented with an asymptomatic reticulated eruption on the thighs. After an extensive workup, she was diagnosed with erythema ab igne caused by laptop computer use. The eruption ultimately cleared several months after discontinuation of direct placement of the laptop computer on her thighs. Erythema ab igne is becoming increasingly associated with exposure to modern heat sources. A thorough history of patients with suspicious lesions should include questioning for contact with alternative heat sources to avoid an unnecessary workup for this condition.