Anal fistula sometimes causes swelling around the anus, and if the symptoms are obvious, medication should be actively given to quickly reduce the swelling. Common medications can be applied to improve microcirculation, such as Diosmin tablets and abortifacient, or you can take 300mg orally twice a day to inhibit histamine and free radical production, and then improve microcirculation, which can make the perianal sinus tract swelling go down quickly. You can also apply fumigation treatment, you can apply Chinese herbal fumigation agents such as Wu Bei Zi Tang, Bitter Ginseng Tang or Pain Relief as Shen Tang, generally the drug is boiled with water and fumigated before washing, or directly use the medicinal solution for local hot compress, which can also play a rapid role in reducing swelling. Sometimes you can also apply the fumigant of thorny root, which can play the role of activating blood circulation, astringent and swelling.