Melanocytic Lesions Basicmedical Key PDF] Morphologic changes of acquired melanocytic nevi with eccentric foci of hyperpigmentation ("Bolognia sign") assessed by dermoscopy. Semantic Scholar Congenital Melanocytic Nevus: Causes, Symptoms, and Treatment 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 Melanocytic Lesions Part 3 Cutaneous and Oral Melanocytic Nevi: Background, Pathophysiology, Etiology