Ungual Melanotic Macules DoveMed Pathology Outlines Common acquired nevus This is a very rare case of metastatic oral mucosal melanoma to the colon with an unusual presentation mimicking melanosis coli. The colonoscopy findings show no mass effect but multiple hyperpigmented lesions Subungual Melanocytic Lesions: Key Clinical and Pathologic Concepts and Biopsy Techniques Actas Dermo Sifiliogrficas