If the anal fissure is caused by hard stool and it is not suppurative or inflamed, you can soak it in boiling water with table salt, wait until it is lukewarm or moderately warm, and easily wash away the stool, and then apply "green ointment" (lidocaine or linocaine). Mycomycin ointment), once a day, but wash it after every bowel movement. If you have hard stool, eat more fruits and vegetables to facilitate defecation. You should not eat meat or drink soup until the anal fissure is healed, including meats such as fish, chicken, sheep, and beef. Defecate on time every day, do not stay up late, and do not overwork. If you have suppuration and pain, you should go to the hospital for treatment. Do not delay, because many rectal injuries such as anal fissures and hemorrhoids turn into cancer.