The aim of the study: clinical evaluation of the use of the drug Laennec in patients with lichen planus. Materials and research methods. Under supervision there were 42 patients with lichen planus (men-27, women-15) aged 18 to 45 years and disease duration from 5 months to 16 years. In most patients, the onset of the disease is associated with neuropsychological trauma. Based on the clinical manifestations (papular rashes with a shiny surface and the presence of punctate impressions, polygonal shape and accompanied by intense itching of the skin), favorite localization and the presence of a Wickham mesh symptom, patients were diagnosed with lichen planus (cases of atypical forms of lichen planus were excluded)