Potassium permanganate is dissolved in hot water and then the temperature of the water is gradually reduced to around 40°C. The reason why cold water is not suitable is because potassium permanganate is not soluble enough in cold water, which will affect the effect of the drug. In addition, using cold water to wash the vulva will increase the patient’s discomfort and will not be beneficial to the treatment of the disease. Potassium permanganate is not a regular gynecological lotion, usually used when there is a wound on the vulva or to promote the healing of vulvar wounds after childbirth, the main purpose is to keep the vulva dry, some vulvar skin lesions can also be used appropriately, but must be used under the guidance of a doctor, do not use blindly.