The long pimples after potassium permanganate sitz bath may be allergic, may be caused by the solution concentration is too high, may also be aggravation of hemorrhoids caused by, should consult the doctor in time to find out the cause of the disease. Potassium permanganate is a disinfectant and antiseptic drug with good disinfectant and bactericidal effect. It is suitable for acute dermatitis or acute eczema, especially for wet dressing with secondary infection, and can also be used to clean small ulcers. 1. Some allergic patients, after using potassium permanganate sitz bath, can cause perianal epidermal inflammation. The patient’s pimples can be manifested as papules, erythema, blisters and other polymorphic damages, and accompanied by itching. 2. Potassium permanganate belongs to strong oxidizing agent, in the use of the need to strictly in accordance with the doctor’s instructions for preparation, high concentration repeated multiple times in the sitz bath can cause corrosive burns of the skin, the appearance of small pimples. 3. In the process of using potassium permanganate sitz bath to treat abscesses and swelling caused by hemorrhoids, if you squat for a long time or keep the same position, it may lead to the local mucous membrane of the rectum in a congested and edematous state, and it may aggravate hemorrhoids, leading to prolapse of hemorrhoids and the formation of “pimples”. Potassium permanganate sitz bath should consult a doctor in advance to understand the use of drugs, adverse reactions, such as the use of drugs during the emergence of serious, persistent discomfort, and timely consultation.