Perianal abscess is a common disease in general surgery, mainly seen in infants and children. The main cause is the formation of abscess due to local perianal infection, which is generally drained by surgical excision and drainage and gradually recovered. The recovery process is mainly the gradual replacement of necrotic tissue with fresh granulation and the drainage of necrotic tissue. In clinical practice, if the abscess is large, gauze is commonly used as drainage material to fill the abscess cavity, and the process of changing the gauze daily will remove the necrotic material from the abscess cavity, and then through local dressing changes and wound cleaning, fresh granulation will slowly arise to fill the entire abscess cavity before the outer opening is finally grown. Alternatively, the necrotic material in the abscess cavity can be cleaned by means of a sitz bath with localized potassium permanganate, replacing the localized necrotic material with fresh granulation. Therefore, the key element in the whole process is to let the fresh buds in the abscess cavity grow slowly before healing the external opening. If the external opening heals first, the formation of a dead cavity will easily cause secondary infection.