a Melanotic macule at the wetdry line of the lower lip. b Melanotic Download Scientific Diagram Figure 2 from Oral pigmentation Semantic Scholar Oral pigmented lesions: a pragmatic approach to diagnosis and management Faculty Dental Journal 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