Umbilical vellus is an umbilical yolk duct residual tissue (embryonic residual tissue) proliferation, also known as umbilical yolk duct polyp (umbilical omphalomesenteric duct polyp) or umbilical polyp (umbilical polyp). In layman’s terms, umbilical polyp is a cherry-red, smooth and moist polypoid growth that appears on the wound after the umbilical cord is detached from the child’s umbilical cord, and there may be a small amount of “pus”-like secretion (which may be bloody if it is bruised). In the past, the treatment of umbilical antler was often given corrosive substances, the pain of the child is great, the recovery time is long, and it is easy to be infected, and the one-time surgical resection requires hospitalization, which is costly and complicated. At present, the use of ionization equipment to cure the umbilical antler in one go, the operation is delicate, does not require hospitalization, and less expensive, less pain and faster recovery of the child.