Potassium permanganate, also known as PP powder, is a strong oxidizing agent that has a killing effect on various bacteria, fungi and other pathogenic microorganisms. It is mainly used as a wet compress for acute dermatitis or acute eczema, especially with secondary infection, and can also clean small ulcers, etc. Patients need to pay attention to the following points when using potassium permanganate: 1. Long-term use is likely to make the skin colored; 4, in the use of the drug site if a burning sensation should be stopped, and the local drug will be cleaned, if necessary, to consult a physician or pharmacist.