Stevens-Johnson Syndrome and Toxic Epidermal Necrolysis

Toxic epidermal necrolysis (TEN) is an acute dermatologic disease, the presentation of which may constitute a true emergency. The disorder is characterized by widespread erythematous macules and targetoid lesions; full-thickness epidermal necrosis, at least focally; and involvement of more than 30% of the cutaneous surface. Commonly, the mucous membranes are also involved. Nearly all cases of toxic epidermal necrolysis are induced by medications, and the mortality rate can approach 40%.

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