Hyperpigmented macules in the oral mucosa and melanonychia JAAD Case Reports 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 Oral Malignant Melanoma Oral Cancer Foundation Information and Resources about Oral Head and Neck Cancer Mystery behind labial and oral melanotic macules: Clinical, dermoscopic and pathological aspects of Laugier Hunziker syndrome A Case Series on Intraoral Blue Nevi with a Literature Review Based Clinico Pathologic Comparison of Intraoral Blue Nevi with Other Oral Melanocytic Nevi