[Ongoing clinical study of oral lichen planus (OLP) treated with retinoids: one used locally, (tretinoin) the other orally (etretinate)].

Twenty patients with oral lichen planus (OLP) were divided into two groups. The first group (8 reticulated OLP, 2 hyperkeratotic OLP) was treated with topical tretinoin. The second group (4 reticulated OLP, 6 eroding OLP) was treated with oral etretinate. All patients were regularly followed in order to observe over a period of five years the evolution of the lesions under treatment, the side-effects and recurrences when the treatment was discontinued.