Perianal abscess is a bacterial purulent infection of the perirectal space of the anal canal and most of them need to be given surgical treatment; no sitz baths are needed before the surgery, while potassium permanganate solution as well as related traditional Chinese medicines (Cyperus rotundus, Boswellia serrata, etc.) can be used for sitz baths after the surgery. 1. Western medicine: after the operation of perianal abscess, potassium permanganate solution with the concentration of 1:5000 can be used for sitz bath, which can clean the wound, anti-inflammatory, reduce swelling and relieve pain; it can play a better therapeutic effect for the patients who have oedema and obvious pain in the wound after the operation. 2. Chinese medicine: Chinese medicine bath needs dialectical treatment, such as wound swelling and pain, give the swelling and pain relief Yuanhu, alum and other Chinese medicine bath; slow growth can be given to remove the rot muscle frankincense, myrrh and other Chinese medicine bath; wound and the surrounding itching is serious can be given to cypress, bitter ginseng and other baths. The specific situation is recommended to go to the hospital, improve the examination, clear condition, the drugs used in the bath must be used under the guidance of a professional physician, not blindly use their own drugs, so as not to cause adverse drug reactions.