Pediatric anal fissures are caused by dry stools that are difficult to expel, resulting in longitudinal fissures at the level of the subdental line of the anus and even bleeding and painful symptoms. Anal fissures should be treated by taking sitz baths with warm salt water for about 10 minutes each time, twice a day. At the same time, you can apply some ointments such as Bactrim for lubrication and wound protection to promote healing and healing, or if you are not allergic to Ma Ying Long hemorrhoid cream, you can also use it. The fundamental problem of anal fissure is dry stool, so change the nature of the stool, regulate your diet and form good bowel habits. Drink more water, eat more vegetables, eat more foods with fiber, and in severe cases, take lactulose to soften the stool, or add probiotics. It is also very important to form good bowel habits to help defecate and reduce the occurrence of anal fissures.