Bouloc et al in 1998 evaluated lichen planus and found linear IgG and C3 precipitation in basal membrane region in samples labeled with immunofluorescence method around dermal bolls.11 Seishima et al used direct immunofluorescence technique in skin around lichen planus and found linear IgG precipitation in basal membrane.12 The main purpose of this study was evaluation of applicant potentials of immunohistochemical method differentiating OLP from OLL. This evidence concerns the gene C3 and lichen planus.