This is a picosecond laser treatment of labial melanotic macules on the gingiva. Note the green flashes of the 532 nm laser as well as the immediate tissue whitening of the treated area. This Not Cancer! Understanding Dark Spots in the Mouth, Have you noticed a dark spot on your lips, gums, or inside your mouth? Dont panic! In this video, Dr. Shifali Arora explains melanotic macules a 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 Labial melanotic macule What Caused These Multiple Hyperpigmented Macules of the Mouth?