Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Stevens-Johnson syndrome ?
    ### Response:
    Stevens-Johnson Syndrome (SJS), also called erythema multiforme major, is a limited form of toxic epidermal necrolysis. This disorder affects the skin, mucous membranes and eyes. Stevens-Johnson syndrome occurs twice as often in men as women, and most cases appear in children and young adults under 30, although it can develop in people at any age.
    