The short version
- Doctors diagnosed a child with erythema ab igne after ruling out trauma and internal injury.
- The condition resulted from resting a charging laptop on the abdomen for extended periods.
- The skin damage resolved completely once the heat source was removed.
A recent medical case report published in BMJ Case Reports details an unusual instance of physical harm linked to daily technology use. Two physicians from the United Kingdom documented the progression of a skin condition in a child that initially presented as mysterious bruising before being identified as heat-induced damage. The case underscores how modern habits, such as resting heavy electronic devices on the body for long durations, can lead to specific dermatological issues that may not be immediately obvious to patients or caregivers.
The patient, described only as being in mid-childhood, arrived at an emergency department with distinct markings on his abdomen. The affected area covered a patch approximately fifteen centimeters wide and featured flat, reddish-brown lines that interlaced to form irregular circles. This lace-like pattern was not tender or warm to the touch when first observed. The boy reported no pain, and his parents could not recall any recent injuries or illnesses that might explain the sudden appearance of the marks. His general health, growth metrics, and medical history were otherwise unremarkable.
Initial assessments by nursing staff suggested spontaneous bruising. A physical examination revealed no other skin abnormalities, abdominal tenderness, or signs of organ distress. To investigate further, medical professionals ordered a chest X-ray, which showed a small area of whiteness over the left lung, potentially indicating fluid or cells such as pus or blood. As blood tests were conducted, the boy disclosed that he had been pushed into a chair during play-fighting with siblings about a week prior. He had withheld this information to protect his siblings from trouble.
This new detail shifted the diagnostic focus toward potential traumatic injury. Doctors performed a computed tomography scan to check for internal abdominal damage but found no evidence of trauma beyond the minor lung anomaly seen on the X-ray, which could have been incidental to a mild infection. With no clear cause identified, the medical team discharged the boy with a short course of antibiotics intended for lung infections. They advised his parents to monitor the situation and return if the marks persisted or worsened, acknowledging their uncertainty about the underlying issue.
Two weeks later, the boy returned to the hospital because the condition had deteriorated. The markings had expanded in size, darkened in color, and become tender to the touch. Patches of pink skin appeared, and some areas showed visible breakdown. Faced with this progression, doctors reconsidered their initial assumption of bruising and began asking more detailed questions about the boy’s daily routine. It was during this follow-up that he revealed he was homeschooled and spent significant time using a laptop for his education.
The boy explained that he typically rested the laptop directly on his abdomen while working, sometimes for up to eight hours a day. He often used the device while it was charging, which can generate additional heat. This information provided the missing context needed for an accurate diagnosis. The physicians identified the condition as erythema ab igne, a term derived from Latin meaning redness from fire. It is also commonly referred to as toasted skin syndrome.
Erythema ab igne is a skin disorder caused by repeated, prolonged exposure to low-grade heat that is insufficient to cause actual burns. While it is more frequently observed in adults who use heating pads for chronic pain relief or sit too close to space heaters, it can also affect individuals in certain occupations involving high temperatures, such as glassblowing or metalwork. The characteristic lace-like rash results from damage to superficial blood vessels and the subsequent release of red blood cells, though the exact biological mechanisms are not fully understood.
Despite the alarming appearance of the rash, the prognosis for erythema ab igne is generally favorable. The condition is benign and typically reversible once the source of heat exposure is eliminated. In severe or long-standing cases, some pigmentation changes or scarring may persist, but early intervention usually leads to full recovery. In this case, the boy’s parents reported that the rash faded over several months and eventually resolved completely after he stopped resting the laptop on his abdomen.
This case serves as a reminder of the potential physical risks associated with prolonged contact with electronic devices. While laptops are not hot enough to cause immediate burns, sustained exposure to their operating temperatures can lead to cumulative skin damage. Medical professionals suggest that using laptop stands or desks can help mitigate this risk by preventing direct contact between the device and the body. The incident highlights the importance of considering environmental factors and daily habits when diagnosing unexplained skin conditions.
The report does not indicate any systemic health issues beyond the localized skin reaction. The boy’s recovery was complete, and no long-term effects were noted. However, the initial misdiagnosis as bruising illustrates how easily such conditions can be overlooked without a thorough history of patient habits. As technology becomes more integrated into daily life, awareness of these subtle physical impacts may help prevent similar occurrences in other users.
Sources behind this briefing
Go to the original reporting
- Ars Technica↗Boy developed "toasted skin" condition from using a laptop every day
