Microscopic features of oral mucosal nevi. a, b Compound nevus. Note Download Scientific Diagram PDF] Pigmented lesions of the oral mucosa and perioral tissues: a flow chart for the diagnosis and some recommendations for the management. Semantic Scholar 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 Histomorphometric and Immunohistochemical Characteristics of Oral Melanotic Macule Overlap with Oral Mucosal Lentigo Volume 6 Issue 1 Primary Oral Malignant Melanoma