When pus appears in the anal opening, the first thing you can do is conservative and medication treatment, such as paying attention to diet, then avoiding dry stools, eating more vegetables, and eating more fruits. You can take a sitz bath with warm salt water or 1:5000 potassium permanganate solution to promote the absorption of pus to reduce the extent of pus. You can take oral anti-swelling medication, such as Mai Zhi Ling. Oral anti-inflammatory drugs, such as cephalosporins, and anti-anaerobic bacteria such as metronidazole, tinidazole, etc. If the abscess is getting bigger and bigger and the local fluctuation is particularly obvious, surgery should be performed, and perianal abscess incision and drainage can be performed under local anesthesia or lumbar anesthesia, and postoperative treatment such as drug exchange and anti-inflammation and hemostasis can be given. If a perianal abscess is observed during surgery, it will usually be combined with anal gland infection, which is what we call the internal port, and if the internal port can be found and removed together, the abscess will be solved fundamentally.