Most surgical incisions for hemorrhoid surgery are open, and an open incision has the potential to lead to superficial infection, and inflammatory stimulation has the potential to cause spasm of the perianal sphincter, so a small percentage of patients will experience postoperative anal constriction that is caused by sphincter spasm. Some patients will have more severe pain. Potassium permanganate solution can be used in sitz baths. Since potassium permanganate is a strong oxidizing agent, it should be strictly proportioned before use, and the proportioning ratio is 1:5000 by mass with water, and the color should be light red after proportioning. When used, the anal incision is dipped into the potassium permanganate solution and bathed for 3-5 minutes, which can clean the contaminated material in the incision and reduce the irritation of the incision. Sitz baths can also effectively relieve the spasm of the perianal sphincter and reduce symptoms.