After polyp removal, due to the local mucous membrane will be more or less damaged, because the wound is not covered by the mucous membrane, and thus will ooze out the tissue fluid, which is the appearance of yellowish, watery, transparent material. Generally, after the local wound is completely healed, the yellow water will stop naturally, and it usually takes 5-7 days for the wound to heal. However, it must be free of localized infection for 5-7 days before the yellowing to stop normally. Usually the local exudation period is at most within 48 hours, usually after 48 hours of local infection, the wound began to gradually carry out the healing process, this situation will gradually reduce the yellow water, and when the mucous membrane is completely healed, it will be able to stop.