pp powder, also known as potassium permanganate powder, clinically the main potassium permanganate warm water sitz bath. The specific method is to add 1 mg of potassium permanganate in 5000 ml of warm water, the patient’s traumatic fissure is completely not into the water, each time the sitz bath for 10 minutes, adhere to the 1 ~ 2 weeks can be. Potassium permanganate solution needs to be used now, otherwise its bactericidal effect will be greatly weakened. Potassium permanganate will decompose when it meets heat, and the water temperature should be controlled below 40℃. At the same time, control the ratio of potassium permanganate and water. If the concentration of potassium permanganate is too high, it will stimulate the anus and the skin around the anus; if the concentration of potassium permanganate is too low, the therapeutic effect will be weakened. It is effective for anal fissure and also useful for other anorectal diseases such as hemorrhoids. The mechanism of potassium permanganate solution treatment: potassium permanganate itself is a strong oxidizing agent, through the redox reaction to play a bactericidal effect, relieve the inflammatory reaction of anal fissure and hemorrhoids, and promote the healing of the wound. It is recommended that the patient according to their own symptoms reasonable configuration, if any discomfort in time to the regular hospital.