Potassium permanganate is usually used for acute eczema, dermatitis and other diseases, the concentration is in the safe range, if the concentration is too high it will lead to hyperpigmentation and skin burns. 1. Hyperpigmentation: prolonged or repeated use of high concentration of potassium permanganate will easily lead to hyperpigmentation of the affected skin. 2. Skin burns: As potassium permanganate is a strong oxidizing agent, it can play the role of disinfection, sterilization, antipruritic and promote wound healing within the normal range. However, potassium permanganate has certain corrosiveness, if the concentration is too high, it will lead to the formation of skin and mucous membrane damage, ulcers and other conditions in the affected area, which may further complicate the infection. Therefore, when using potassium permanganate, it should be used in strict accordance with the instructions or medical advice.