PDF] Oral melanoacanthoma and oral melanotic macule: a report of 8 cases, review of the literature, and immunohistochemical analysis. Semantic Scholar Melanosis coli** Melanosis coli is a benign, reversible condition characterized by brown black pigmentation of the colonic mucosa, most often due to chronic use of anthraquinone laxatives. The discoloration is caused Pigmented Oral Lesions: Clues to Identifying the Potentially Malignant Consultant360 Melanosis coli Wikipedia Citalopram Induced Oral Melanotic Macules in a Female Patient and a Review of the Literature Cureus