A bag next to the anus, there are several cases: 1, perianal abscess: this situation often manifests itself as a local mass of redness, swelling, heat, pain, sometimes the temperature will reach 38-39 ℃, and when defecating obviously feel pain. 2, anal fistula: due to long-term, repeated hyperplasia of fistula and sinus tracts, and then the formation of a mass. 3, polyps: a bag next to the anus may be a perianal polyp or The company’s main business is to provide a wide range of products and services to the public. All in all, if there is a mass next to the anus, it is best to go to a regular hospital to improve the relevant ultrasound examination, find the cause and then take different treatment methods according to the cause.