Monarch Disease Ontology entry MONDO_0006550 (fibroepithelial polyp of urethra) is a benign polypoid lesion of mesodermal origin that arises from the urethra. Also known as: fibroepithelial polyp of the urethra, urethra fibroepithelial polyp, urethra skin tag, urethral fibroepithelial polyp.