Differential Diagnosis of Pigmented Lesions in the Oral Mucosa: A Clinical Based Overview and Narrative Review Melanocytic nevi (moles) are common benign proliferations of melanocytes. While most remain stable over time, changes in morphology or pigmentation warrant attention. Think science and self awarenessyour skin tells a story. #dermatology #studentclub # Subungual Melanocytic Lesions: Key Clinical and Pathologic Concepts and Biopsy Techniques Actas Dermo Sifiliogrficas 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