Whether it is a natural tear or an incision, it usually heals in 3-5 days and needs to be washed twice a day with warm water. To prevent wound contamination, wipe and rinse the vulva with a sterilized cotton pad after each defecation. Do not wipe from back to front, but wipe from front to back and rinse again; be sure to change sanitary napkins frequently to avoid getting the wound wet. (2) Prevent the perineal incision from dehiscence: Do not use air to expand the perineum when constipated. Use Kailu or liquid paraffin to lubricate it, especially when removing the perineal incision.