[Toxic epidermal necrolysis (Lyell syndrome), a lifethreatening emergency of introgenic origin].

Cutaneous drug eruptions are frequently encoun¬tered. Their putative diagnosis is based on a set of imputability arguments. The histopathological aspect is often suggestive of the dermatosis nature, and varies according to the type of drug reaction. Some drug eruptions follow a benign course, but others including the toxic epidermal necrolysis are severe and life-threatening. It corresponds to a dermatological emer¬gency to be managed in a specialized burn unit.