Pigmented Oral Lesions: Clues to Identifying the Potentially Malignant Consultant360 Lingual melanotic macule the first case report in an adult patient* Anais Brasileiros de Dermatologia Figure 2 from Smokers' melanosis in a Nigerian population: Melanosis coli is dark brown black pigmentation of colorectal mucosa associated with chronic use of laxatives containing anthraquinone. Examples of such laxatives include senna and rhubarb derivatives. Clinical Importance: There is no association Pigmented Oral Lesions: Clues to Identifying the Potentially Malignant Consultant360 Oral Mucosal Melanosis IntechOpen