Oral Melanotic Macule: Symptoms and Treatment Skinsight Pigmented Lesions of the Oral Mucosa Pocket Dentistry Melanocytic Lesions A Guide to Clinical Differential Diagnosis of Oral Mucosal Lesions Continuing Education Course dentalcare.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 A Black Spot on the Upper Gum for Many Years: Melanotic Macule Springer Nature Link