In addition, rectal mucosal prolapse should be considered. Patients often have a history of rectocele. Prolapsed tissue stimulates the rectal wall, resulting in increased secretion. Increased secretion will cause the anus damp and anal pruritus. In addition, the existence of anal fistula should be considered. Due to the recurrent anal fistula, pus constantly flows out, which will stimulate the perianal skin and lead to the anus damp itching. In this case, a linear fistula can be felt around the anus, leading to the anus. The fundamental treatment is surgical incision and drainage.