Pigmented (Purple or Brown) Lesions in the Mouth Pigmented (Purple or Brown) Lesions in the Mouth Kazemi Oral Surgery Facialart.com Happy Wednesday! , In this video, a patients labial melanotic macule (a benign pigmented lesion) is being treated with liquid nitrogen. Labial melanotic macules are flat and asymmetrical with a Pigmented Lesions of the Oral Cavity Oral and Maxillofacial Surgery Clinics Melanotic macules of the tongue in a newborn Journal of the American Academy of Dermatology 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 Labial Lentigo (labial melanotic macule) Cancer Therapy Advisor