Potassium permanganate can be used to treat eczema, mainly for skin infections secondary to eczema. The rash is characterized by redness and swelling around the rash, yellow vesicles, yellow oozing and yellow crusting, and the patient may have a degree of fever. If the white blood cells and neutrophils are elevated, this type of eczema is suitable for treatment with potassium permanganate. The main method is to take a basin of warm water and put a piece of potassium permanganate in it, dip a sterile gauze in the solution, wring it out and wipe the eroded surface without dripping. At the same time, oral antihistamines such as levocetirizine hydrochloride capsules and oral antibiotics should also be taken for treatment.