In addition, the results were compared with the results of biopsies and toluidine blue staining.9 Since no definitive treatment is available for lichen planus, and treatment with local steroids is the first line of symptomatic treatment,1 in the present study, CEA and IgG serum levels and visual analog scale (VAS) scores were evaluated before and after treatment with local steroids. The gene discussed is CEACAM5; the disease is lichen planus.