Pigmented Lesions of the Oral Cavity Oral and Maxillofacial Surgery Clinics 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 (Purple or Brown) Lesions in the Mouth Pigmented (Purple or Brown) Lesions in the Mouth Kazemi Oral Surgery Facialart.com Multifocal Pigmentation of the Oral Cavity The Journal of the American Dental Association