The anus opened a mouth, first of all, we should observe the size and depth of the fissure: 1, if it is an anal fissure, such as fissure of the skin of the anal canal caused by the dryness of the stool, the general anal fissure trauma will not be particularly large, and the fissure will not be deep. You can take conservative or drug treatment, pay attention to diet, avoid spicy and stimulating food. Warm salt water or 1:5000 potassium permanganate solution sitz bath, promote perianal circulation, can promote the healing of the fissure, and then you can apply perianal trauma hemorrhoidal cream, such as taining cream, i.e., the compound keratine acid ester, can play an anti-inflammatory, anti-itching, pain relief, swelling effect. If the fissure of the anal fissure is relatively large, the blood in the stool is more, should be timely anal fissure resection. 2, if the anal fissure, because of trauma, should be timely debridement, if the fissure is relatively large, or damage to the blood vessels lead to a large amount of bleeding, should be timely bleeding suture, perianal fissure suture, post-operative anti-inflammatory and hemostatic treatment.