Widespread Cutaneous Reactions: A spectrum of disease.

The three cutaneous reaction patterns of erythema multiforme, Stevens-Johnson syndrome, and toxic epidermal necrolysis share many clinical features. Each is multifactorial in etiology; together they account for most severe cutaneous drug eruptions. In some respects, they can represent a progression in the severity of drug eruptions. Controversy continues to cloud the clinical delineation, etiology, and treatment.