Potassium permanganate solution is an acidic solution that can treat inflammation of the vulva and also improve the environment of the vagina, so that if the environment of the vagina is changed into an acidic one, other bacteria can be prevented from growing inside the vagina. In normal women, due to estrogen and lactobacillus bacteria, the pH of the vagina is usually less than 4.5, but if the vagina is infected by other bacteria, the pH of the vagina will rise. If you take a sitz bath with potassium permanganate solution at this time, it can increase the acidity of the female vagina, thus improving the defense function of the female vagina and preventing other pathogens from growing and reproducing in the female vagina. So it not only has a therapeutic effect, but also a defensive effect.