Multifocal pigmentation of the oral mucosa The Journal of the American Dental Association Oral pigmented lesions: Clinicopathologic features and review of the literature The Prevalence of Oral Pigmented Lesions among Sample of Dental Students. 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 (Purple or Brown) Lesions in the Mouth Pigmented (Purple or Brown) Lesions in the Mouth Kazemi Oral Surgery Facialart.com