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 Pigmented Lesions of the Oral Cavity Pocket Dentistry Diagnosis of oral pigmentations and malignant transformations ScienceDirect Pathology Outlines Melanotic macule Dentistry and Medicine: Pigmentation and Discoloration of Oral and Facial Tissues