There are two main reasons why the anus does not wipe clean and always has stool. First, due to anal trauma or other pathological factors leading to relaxation of the anal sphincter, when coughing violently or holding urine intra-abdominal pressure increases, it can lead to anal outflow of stool, thus appearing anal wipe not clean, always have stool. Secondly, anal fistulas are mostly secondary to rectal perianal abscesses, mainly consisting of three parts: the inner mouth, the fistula and the outer mouth. The typical clinical manifestation is intermittent anal pus or stool flow, and a hard lump like strips can be palpated in the anus. Do not panic when the anus is not clean and there is always stool, you should immediately go to the regular hospital anorectal surgery or general surgery, perform anal finger examination or anoscopy to clarify the cause, and carry out reasonable treatment under the guidance of a specialist. At the same time, you should wash your anus in time in daily life and pay attention to keeping it locally clean to avoid inducing infection.