Focal melanocytic lesions of the oral mucosa: An epidemiological and morphological study Santana 2023 Oral Diseases Wiley Online Library 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 Histopathology of Oral Hyperplastic and Neoplastic Lesions Springer Nature Link Melanotic macule. Benign. Dark spot on labia (or lip). Analogous to lentigo simplex. Hyperpigmented basal keratinocytes & dermal melanophages. Slight in single basal melanocytes; NO nests. More info like this in Pigmented Lesions of the Oral Mucosa: Clinical Presentation, Histology, and Recommendations for Management