A Black Spot on the Upper Gum for Many Years: Melanotic Macule Springer Nature Link A Rare Case of Oral Mucosal Pigmentation: Differential Diagnosis and Case Presentation JCDA 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 Pigmentary Disorders Springer Nature Link