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 Pathology Outlines Staging mucosal melanoma of the head & neck a Melanotic macule at the wetdry line of the lower lip. b Melanotic Download Scientific Diagram Oral Melanoacanthoma: Case Series of 33 Cases and Review of the Literature Head and Neck Pathology Springer Nature Link