Lichen sclerosus (LS) is a lymphocyte-mediated inflammatory dermatosis with a characteristic location (85-98%) in the anogenital region. The authors point out the main features in the epidemiology and clinical presentation of the disease and the possible approach to neoplastic development. Expanded differential diagnosis of LS sparked not only dermatologists but also gynecologists, urologists and GPs. Points are the chronic course of the disease and resistance to therapy. Discuss the results of the treatment of LS with less potent topical corticosteroids, calcineurin inhibitors, phototherapy and photodynamic therapy, surgery.