Familial lichen planus is a rare form of lichen planus characterized by an early onset, prollonged course, involvement of oral mucosa and atypical clinical forms.

Different enviromental or genetic factors have been investigated in its pathogenesis. Herewith two members of a familiy affected with lichen planus, with typical clinic features of the familiar variant are reported. No enviromental nor infectious agent was identified. Previous reports of familial cases of lichen planus as well as the long interval between onset of the disease in the affected members of the family speak in favor of a genetic predisposition.