Allergic dermatitis is mainly caused by contact with allergens, and potassium permanganate is a disinfectant and antiseptic, which can only be used as an adjunctive treatment for allergic dermatitis, not as a first-line drug. Patients may come into contact with allergens through skin, mucous membranes, inhalation, injection, ingestion, etc., which leads to abnormal immune response of the body, and the activation of the immune system to attack the allergens will lead to inflammatory reaction, resulting in eczema, urticaria, drug rash, contact dermatitis, atopic dermatitis, etc. For atopic dermatitis, the main focus is on finding and removing the irritant or cause, and working with your doctor to treat it with oral antihistamines, such as loratadine and cetirizine. Washing with potassium permanganate alone is not effective in treating atopic dermatitis. Therefore, patients with atopic dermatitis should avoid the blind use of potassium permanganate cleaning, it is recommended to promptly go to the hospital, under the guidance of the doctor targeted treatment and therapy.