Pigmented Lesions of the Oral Cavity Oral and Maxillofacial Surgery Clinics A Black Spot on the Upper Gum for Many Years: Melanotic Macule Springer Nature Link Differential Diagnosis of Pigmented Lesions in the Oral Mucosa: A Clinical Based Overview and Narrative Review Labial melanotic macule Clinical Challenge: Dark Lesion on Lower Lip MPR Congenital Melanocytic Macule of the Tongue in a Newborn Cureus