Potassium permanganate is usually used in the ratio of 1:5000 to formulate potassium permanganate solution for treatment, the concentration should not be too high, the concentration will be too high corrosive, to avoid adverse effects on the body. Potassium permanganate is a strong oxidizing agent, has the effect of disinfection and sterilization, generally used for acute dermatitis or acute eczema treatment, if accompanied by bacterial infections can generally be used for local wet compresses, for a small area of ulcers can also be carried out for the local rinsing, the concentration is generally 1:5000. If the concentration of potassium permanganate is too high, it may lead to skin and mucous membrane damage, causing local pain or local ulcers, long-term use is likely to lead to skin area coloring, so that the local skin pigmentation, may also appear redness, swelling, itching, to stop the drug in time. It should be used correctly under the guidance of a doctor to avoid the effects of too high a concentration on the body.