Labial melanotic macules in atopic dermatitis. (a) Multiple macular Download Scientific Diagram Any information on dark spots on the bottom lip? Simple cryosurgical treatment of the oral melanotic macule ScienceDirect ORAL MELANOTIC MACULE (OMM) (Also called focal melanosis labial melanotic macule) A benign, localized, flat pigmented lesion of the oral mucosa Caused by a focal increase in melanin production 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 Venous Lake of Lip and Lip Freckle Removal with Iridex Laser