[The major SCAR syndromes].

Some drug eruptions are frequent and follow an indolent course, while others prove to be life-threatening. By contrast, SCAR syndromes are serious skin drug reactions that are rare but their vital prognosis is affected. The three distinct entities of importance are the former Lyell's syndrome, now identified as SJS-TEN syndrome (Stevens-Johnson syndrome/toxic epidermal necrolysis), the DRESS syndrome (drug reaction with eosinophilia and systemic symptoms), and the AGEP syndrome (acute generalized exanthematous pustulosis).