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 Melanocytic Lesions A Guide to Clinical Differential Diagnosis of Oral Mucosal Lesions Continuing Education Course dentalcare.com A Rare Case of Oral Mucosal Pigmentation: Differential Diagnosis and Case Presentation JCDA Pigmentation on the oral mucosa, hands, and feet European Journal of Internal Medicine