“…10 of the 46 other cases of EC may have been triggered by drugs: penicillin G [2,4] in 3 cases, ampicillin [2], erythromycin [7], cyclins [11,12], bleomycin [12], chloram bucil [12], local anesthetic [4] and acetyl salicylic acid [4,11], A mechanism mediated by immune com plexes has been suggested for EC [2,9,12,15,16]. Direct IF of involved skin revealed a positive reaction for C3 in the walls of der mal vessels in 4 cases [2,4,16,17] as in our case, and for C3 and IgM along the base ment membrane in 2 cases [7,12], Tests for circulating immune complexes have been performed in 3 cases of EC [2,10,12] but were negative.…”