Pathology Outlines Oral mucosal melanoma Pathology Outlines Pigmented epithelioid melanocytoma Transformation of a benign oral pigmentation to primary oral melanoma ScienceDirect 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 Pathology Outlines Mucosal melanoma (genital, oral, sinonasal)