Pigmented Oral Lesions: Clues to Identifying the Potentially Malignant Consultant360 a Melanotic macule at the wetdry line of the lower lip. b Melanotic Download Scientific Diagram A Black Spot on the Upper Gum for Many Years: Melanotic Macule Springer Nature Link Figure 2 from Oral pigmentation Semantic Scholar Oral Mucosal Melanosis IntechOpen 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