[Association lichen planus and ulcerative colitis. A case report].

Ulcerative colitis is a frequent chronic inflammatory boxel disease. Its cutaneous manifestation are varied. Some of them are frequent like pyoderma gangrenosum, erethema nodosum and oral ulceration. We report the case of an exceptional association of ulcerative colitis with lichen planus in a 40-year old woman with a 2 year history of ulcerative colitis, who had lesions on the buccal mucosa and the lower lip for which the diagnosis of lichen planus was made and confirmed histologically.