Pigmented lesions of the oral mucosa and perioral : Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, & Endodontics COM August 2004 Diagnosis UW School of Dentistry 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 Gum Hyperpigmentation: When to Seek Help? Aesthetic Depigmentation of Gingival Smoker's Melanosis Using Carbon Dioxide Lasers