Stevens–Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) are two forms of a life-threatening skin condition, in which cell death causes the epidermis to separate from the dermis. The syndrome is thought to be a hypersensitivity complex that affects the skin and the mucous membranes. The majority of cases are idiopathic (without a known cause). The main known cause is certain medications, followed by infections and, rarely, cancers.
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