Black spot inside cheek: Pictures, causes, treatment, and more 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 Figure 1 from Oral melanotic macule a case report. Semantic Scholar Black spot inside cheek: Pictures, causes, treatment, and more What Causes Black Patches Inside the Mouth and How to Address Them? Your Health Magazine