Differential Diagnosis of Pigmented Lesions in the Oral Mucosa: A Clinical Based Overview and Narrative Review 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 Pigmented Lesions of the Oral Cavity Pocket Dentistry A Case Series on Intraoral Blue Nevi with a Literature Review Based Clinico Pathologic Comparison of Intraoral Blue Nevi with Other Oral Melanocytic Nevi