Genital leucoplastic lichen planus is rare, and vulval erosive lichen planus seams to be more frequent but often ignored. Vaginal manifestations were unknown until I first reported with Pr J. Hewitt in 1982 the vulvo-vaginal-gingival syndrome: a new form of plurimucosal lichen planus .The symptoms are: vulval pruritus, vulval chronic pain, orificial dyspareunia which can prevent coitus, leucorrhea and spontaneous or post-coital bleeding.On the vulva the diagnosis is sometimes easy because of the presence of a typical reticulated plaque at the periphery of the erosive vestibulitis, but sometimes the white reticulated lesions are less obvious. But carefull examination could find a tiny white pattern at the periphery of the vestibulitis; the biopsies must be taken on those areas to be usefull for the diagnosis, because the histology on erosive areas is non specific.In some cases the clinical features ressemble the erythemateous forms of lichen sclerosus and the anatomical structure of the labia minora and the clitoris is either effaced or altered by adhesions. Orificial stenosis occurs in 30% of the cases.The clinical appearance of vaginal erosive lichen planus is similar to the desquamative imflammatory vaginitis described by Gray and Branes in 1965. The causes of desquamative vaginitis are still unknown, however following certain cases of erosive vulval lichen planus, I noticed such vaginal lesions may be associated with: a vaginal involvement is noticed in 71% of the cases with vaginal synechiae in 63% of the cases.When such erosive vulvovaginal lesions are found, an oral examination is necessary, looking for the presence of a desquamative or erosive gingivitis or other oral determination of lichen planus as well as cutaneous involvement.Genital erosive lichen planus is a chronic disease, the course of the disease is one of exacerbations with slow healing. The treatment is mainly topical using potent local corticosteroids and hydrocortisone foam (Colofoam) for the vagina. In recalcitrant cases, systemic corticosteroids or retinoids or sulfones must be tried.