Differential diagnosis of an oral mucosal pigmented lesion: a case of essential melanosis 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 Pigmented Lesions of the Oral Mucosa Pocket Dentistry Dental Update Malignant oral melanoma: how to spot it and how it is managed Dental Update