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 A Rare Case of Oral Mucosal Pigmentation: Differential Diagnosis and Case Presentation JCDA Pathology Outlines Melanotic macule a Melanotic macule at the wetdry line of the lower lip. b Melanotic Download Scientific Diagram Pigmented Lesions of the Oral Mucosa Pocket Dentistry AD :: Annals of Dermatology