[Hyper keratotic oral lichen planus and malignant transformation].

Oral Lichen Planus (OLP) is a chronic inflammatory dermatosis usually benign that can affect skin, integuments and mucosal membranes. It is characterized by a disorder of keratinization and the polymorphism of clinical disease. Some of them correspond to a very intense lichen activity as erythematous, erosive and bullous forms, others concern mostly old forms of lichen planus as atrophic or hyperkeratotic and hypertrophic verrucous forms. In most of the cases, the OLP has a benign evolution but malignant transformation may occur warranting strict monitoring of the disease and effective treatment of exacerbations.