PDF] Oral melanoacanthoma and oral melanotic macule: a report of 8 cases, review of the literature, and immunohistochemical analysis. Semantic Scholar This is a very rare case of metastatic oral mucosal melanoma to the colon with an unusual presentation mimicking melanosis coli. The colonoscopy findings show no mass effect but multiple hyperpigmented lesions Pigmented Lesions of the Oral Mucosa Pocket Dentistry Extension Without Malignant Changes in Oral Melanotic Macule: A Report of Two Cases and Review of the Literature