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 Benign melanocytic naevi Six features of melanocytic lesions at level 1 of first step. a) Download Scientific Diagram Labial melanotic macule. B). Increased numbers of me lanocytes along Download Scientific Diagram Melanocytic Lesions and Disorders of Pigmentation Obgyn Key PDF] Morphologic changes of acquired melanocytic nevi with eccentric foci of hyperpigmentation ("Bolognia sign") assessed by dermoscopy. Semantic Scholar