Anal fissure refers to a small ulcer formed by the skin cracking below the dentate line of the anal canal, with the main symptoms being pain and bleeding. Anal fissure excision surgery is one of the surgical treatments for anal fissures. It mainly involves removing the anal fissure, the sentinel piles, and the hypertrophied anal papillae. It also involves cutting a part of the internal and external sphincter's subcutaneous section. The wound is left open for drainage. A disadvantage is that healing is relatively slow, so it generally takes over a month to fully recover after the surgery.