Laptop Heat Exposure Linked to Rare Skin Condition in Children

A pre-teen boy arrived at the hospital with a mysterious rash across his abdomen and what looked like bruising that had persisted for a week. Neither he nor his parents could identify what had caused it. The initial suspicion was liver damage from some unnoticed trauma, so doctors ordered blood work and imaging. Everything came back normal. He was sent home.

Two weeks later, he returned. The rash had worsened. It was tender now, and patches of skin were peeling away. This time, when doctors pressed harder on the history, the boy mentioned something his family had overlooked: he was being home-schooled and spent his days working on a laptop. Not at a desk. He balanced the device directly on his bare abdomen, often while it was charging, for as long as eight hours at a stretch.

The diagnosis came quickly after that: erythema ab igne, a heat-induced skin condition marked by a distinctive fishnet-patterned rash and discoloration. It's a condition doctors have known about for decades, but they've mostly seen it in adults—people who used hot water bottles or heating pads regularly. The mechanism is straightforward: prolonged exposure to low-grade heat damages the small blood vessels in the skin, creating the characteristic pattern and darkening. The boy was told to stop resting the laptop on his body. Within months, the rash faded. The discoloration gradually resolved.

What caught the attention of the physicians who treated him, and what they documented in the journal BMJ Case Reports, was not the rarity of the condition itself but its resurgence in children. The shift is recent and direct: as remote schooling became routine and laptops became the primary tool for education, more children are developing this once-uncommon problem. The devices generate heat, especially when plugged in and running resource-heavy applications. A child sitting with a laptop on their lap or abdomen for hours at a time is essentially applying a low-temperature heat source to their skin, day after day.

The doctors who published the case note that this pattern represents an under-recognized hazard in pediatric populations. Most parents and children are not aware that a laptop can cause this kind of damage. The condition is not painful enough to stop immediately, and the rash can look like many other things—an allergic reaction, a bruise, an infection. By the time the connection becomes clear, weeks may have passed.

The good news is that erythema ab igne typically resolves once the heat source is removed. The boy's case followed that trajectory. But the medical literature carries a warning: in cases of chronic, long-term exposure, the pigmentation changes can persist. Rarely, in cases that have gone on for years, the condition can progress to something more serious. The doctors emphasize that prevention is straightforward—keep electronic devices off bare skin, use a barrier like a blanket or desk, and take regular breaks from screen time. For children spending entire school days with laptops, that simple precaution could make the difference between a temporary rash and lasting skin damage.