There is no clinical data on how many days potassium permanganate can be washed, it is generally recommended to wash for 5~7 days, and then adjust the time of medication according to the control of the condition. Potassium permanganate lotion can play a bactericidal effect, commonly used in cleaning wounds, for perineal wounds and wounds left by hemorrhoids can be cleaned with potassium permanganate lotion. It is generally recommended to use it for 5~7 days, and then observe the recovery of the wound, if the recovery is not good or there is still inflammation, you need to prolong the time of using it appropriately. Moreover, the dosage of potassium permanganate lotion and the time of application also differ depending on the size of the wound. If it is only used on the surface of the skin, you can shorten the application time and reduce the dosage; for large-scale injuries and deeper wounds, you need to prolong the application time appropriately. Before using potassium permanganate lotion, it should be noted that it is forbidden to use it if you have vulvar leukoplakia or vulvar cancer or traumatic hematoma; it is also forbidden to use it if you are allergic to the ingredients of the drug. It is not recommended to use potassium permanganate lotion for a long time, otherwise it will cause flora disorders and toxic reactions. If you need to use potassium permanganate lotion, it is recommended to do under the guidance of a doctor, avoid unauthorized operation.