Oral melanoacanthoma and oral melanotic macule: a report of 8 cases, review of the literature, and immunohistochemical analysis Labial Lentigo (labial melanotic macule) Cancer Therapy Advisor 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 Reactive hyperplasias,precancerous and malignant lesions of the oral mucosa Krahl 2008 JDDG: Journal der Deutschen Dermatologischen Gesellschaft Wiley Online Library Hyperpigmented macules in the oral mucosa and melanonychia JAAD Case Reports Pigmented Lesions of the Oral Mucosa: Clinical Presentation, Histology, and Recommendations for Management American Journal of Clinical Dermatology Springer Nature Link