Mystery behind labial and oral melanotic macules: Clinical, dermoscopic and pathological aspects of Laugier Hunziker syndrome Mucocutaneous Pigmented Lesions, Nevi and Melanoma (Chapter 4) Pediatric Head and Neck Pathology Labial melanotic macule. B). Increased numbers of me lanocytes along Download Scientific Diagram 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