Pathology Outlines Pigmented epithelioid melanocytoma Pathology Outlines Melanotic macule Pigmented Lesions of the Oral Mucosa Pocket Dentistry 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 ORAL MELANOTIC MACULE (OMM) (Also called focal melanosis labial melanotic macule) A benign, localized, flat pigmented lesion of the oral mucosa Caused by a focal increase in melanin production