An oral melanotic macule is a harmless dark spot found on the lip, most often the lower lip, or inside the mouth, either on the gums, inside the cheek, or on the roof of the mouth. An oral melanotic Man Concerned About a New Spot On His Lip Let's Diagnose VisualDx Pigmented Oral Lesions: Clues to Identifying the Potentially Malignant Consultant360 Oral Mucosal Melanosis IntechOpen Pigmented Lesions of the Oral Mucosa Springer Nature Link