[Diagnostic and therapeutic problems in lichen ruber ulcerosus].

Report on two patients with ulcerative lichen planus (l.r. u.) of the feet. The experience which results from these two cases and 22 others which have been reported in the literature were the following: 1. After long periods of standing such lesions show a pronounced tendency to become malignant. 2. The only treatment which offers a lasting succes is skin-grafting, the chances of which are the better the earlier it is performed. 3. Early diagnosis of L. r. u. may be impossible on clinical and histopathological grounds only; application of immunofluorescence methods may yield additional diagnostic criteria.