Potassium permanganate sitz bath feel wound pain, on the one hand, may be due to the drug concentration is too high, but also may be due to sitz bath temperature is not suitable and other reasons, it is recommended to stop the sitz bath and wash clean. Potassium permanganate is a topical disinfectant, which can be used for dermatitis, eczema, small ulcers, hemorrhoids, abscesses and other diseases or postoperative adjuvant therapy. It usually needs to be diluted before use. If the concentration of the medicine is too high, it may cause local corrosive burns on the skin or mucous membranes, resulting in pain. In addition, if the temperature of the sitz bath is too cool or too hot, it can also irritate the wound and cause pain. When using potassium permanganate in sitz baths, it must be well diluted using warm water. The drug is prohibited to be taken orally. It is forbidden to share it with iodine complexes, contact with organic substances or share it to avoid explosion. If burning sensation, redness and swelling appear after the use of the drug, it is recommended to stop the use of the drug and rinse it off with water. Potassium permanganate is recommended to be used under the guidance of clinicians, general sitz bath treatment for anorectal diseases, the ratio of potassium permanganate and warm water is 1:5000 solution, the temperature is between 36 ℃ ~ 40 ℃. It is recommended that people follow the doctor’s instructions for safe use.