Erythema ab igne (EAI), colloquially known as 'toasted skin syndrome,' is a dermatological condition resulting from chronic exposure to moderate heat that is not hot enough to cause an immediate burn. Recent reports highlight an increase in diagnoses, particularly among children and adolescents who spend extended periods using laptops or tablets directly on their skin.

Medical experts explain that the condition occurs when heat damages the superficial skin layers, leading to a characteristic reticulated, or net-like, reddish-brown discoloration. While the condition is generally considered benign and often resolves once the heat source is removed, persistent exposure can lead to more permanent skin changes or, in rare instances, long-term complications. The Independent reports on a specific case involving a young boy who developed the condition after resting a laptop on his stomach for up to eight hours daily.

While the condition is not new—historically associated with space heaters, hot water bottles, and coal stoves—the modern prevalence of portable electronics has introduced new risk factors. Dermatologists emphasize that the condition is preventable by ensuring devices are placed on desks or tables rather than directly on the lap or skin. There is no current medical disagreement regarding the cause of EAI; however, public awareness remains limited, leading to concerns that many cases may go undiagnosed or be mistaken for other skin irritations.