Dark Patches Inside Mouth: 7 Alarming Causes Liv Hospital Pigmented (Purple or Brown) Lesions in the Mouth Pigmented (Purple or Brown) Lesions in the Mouth Kazemi Oral Surgery Facialart.com 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 PDF) Labial Melanotic Macule Diagnosed by Dermoscopy Oral Melanotic Macule: Symptoms and Treatment Skinsight