Differential diagnosis of an oral mucosal pigmented lesion: a case of essential melanosis 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 Oral Mucosal Melanosis IntechOpen Mucosal melanocytic macules Pigmentary Disorders Springer Nature Link Pigmented Oral Lesions: Clues to Identifying the Potentially Malignant Consultant360