Nathan M. Albert, BS MDedge Histopathology of Oral Hyperplastic and Neoplastic Lesions Springer Nature Link Pigmented Lesions of the Oral Mucosa: Clinical Presentation, Histology, and Recommendations for Management Oral melanoacanthoma and oral melanotic macule: a report of 8 cases, review of the literature, and immunohistochemical analysis 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 Multifocal pigmented lesions in the maxilla Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology