Figure 1 from Dermoscopy of venous lake on the lips: A comparative study with labial melanotic macule Semantic Scholar PDF] Oral melanoacanthoma and oral melanotic macule: a report of 8 cases, review of the literature, and immunohistochemical analysis. Semantic Scholar 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 Melanotic Macules, Naevi, and Melanoma Springer Nature Link