Oral Melanotic Macule: Symptoms and Treatment Skinsight A Black Spot on the Upper Gum for Many Years: Melanotic Macule Springer Nature Link Pigmented Lesions of the Oral Mucosa Pocket Dentistry Dental Update Malignant oral melanoma: how to spot it and how it is managed Dental Update 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