Gray melanotic macule on the palate in a 50 year old female Download Scientific Diagram Pigmented Lesions of the Oral Cavity Pocket Dentistry What is oral malignant melanoma diagnosis? 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 What Caused These Multiple Hyperpigmented Macules of the Mouth?