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 Pathology Outlines Melanotic macule Oral melanotic macule Mcula melantica oral Mariana Villarroel Dorrego Pigmented Lesions of the Oral Mucosa: Clinical Presentation, Histology, and Recommendations for Management American Journal of Clinical Dermatology Springer Nature Link Pigmented Lesions Pocket Dentistry Oral melanocytic nevi: a clinicopathologic study of 100 cases ScienceDirect