What Caused These Multiple Hyperpigmented Macules of the Mouth? Oral Melanotic Macule: Symptoms and Treatment Skinsight Mystery behind labial and oral melanotic macules: Clinical, dermoscopic and pathological aspects of Laugier Hunziker syndrome 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 PDF) Labial Melanotic Macule Diagnosed by Dermoscopy