Oral melanotic macule and primary oral malignant melanoma: Epidemiology, location involved, and clinical implications ScienceDirect Pigmented Lesions Pocket Dentistry a Melanoacanthoma of the upper labial mucosa. b Histopathologic Download Scientific Diagram Extension Without Malignant Changes in Oral Melanotic Macule: A Report of Two Cases and Review of the Literature Melanotic Macule 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