Potassium permanganate is a strong oxidizing agent and is mainly used for disinfection of the vulva and vagina, so it can be used during breastfeeding. The main consideration for the use of drugs during breastfeeding is the effect on the baby, because some drugs are excreted through breast milk and absorbed by the baby will have a corresponding impact on growth and development. In addition, potassium permanganate is a topical medication and will be absorbed locally by the mucous membrane, but it will not affect the milk, so you can safely wash or take a sitz bath with potassium permanganate. If there is any discomfort in the vagina, go to the hospital for examination and use the medicine under the guidance of the doctor.