Potassium permanganate is not used to treat internal hemorrhoids. Potassium permanganate is a topical drug that is a strong oxidizing agent, and its main therapeutic effect is for external washing around the anus, such as a sitz bath with potassium permanganate solution when there is local itching or minor infection around the anus. Because potassium permanganate has an anti-inflammatory effect, it can also be used for cleaning and disinfection of incisions in postoperative patients. Since potassium permanganate is a strong oxidizing agent, it needs to be used in strict proportion to the ratio, and there is a risk of burning the skin if the concentration is too high. The ratio is 1:5000 by mass to water for the sitz bath, and the bath time is usually about 5 minutes.