Steven-Johnson syndrome involves: (A) Type I hypersensitivity reaction, (B) Type II hypersensitivity reaction, (C) Type III hypersensitivity reaction, (D) Type IV hypersensitivity reaction
Answer is C. Both erythema multiformae and steven Johnson syndrome are due to deposition of immune complexes in the superficial microvasculature of skin and mucosa. These immune complex diseases are mediated through type III hypersensitivity reaction.