Perianal itching and wetness may be caused by rectal polyps, anal fissure, eczema and other diseases. 1. Rectal polyps: refers to the protruding from the surface of the intestinal mucosa to the intestinal lumen of the bulging lesions, a small number of patients may have blood in the stool, the feeling of incomplete evacuation, mucus, polyps out of the stool, perianal itching and wetness and other symptoms. 2. Anal fissure: it is a skin fissure that occurs in the anal verge and anal canal area, which initially originates from the hard and dry stools, damaging the anus and forming ulcers, fissures and bleeding, and it will appear the symptoms of perianal itching and dampness. 3. Eczema: is caused by a variety of internal and external factors of the superficial dermis and epidermal inflammation, self-conscious itching is intense, mainly herpes mound, there is a tendency to ooze, but also perianal itching and dampness and other symptoms. Perianal itching and dampness may also be seen in hemorrhoids, anal fistula and other diseases, if the symptoms of perianal itching and dampness, persistent non-relief, it is recommended that the need to consult a doctor in a timely manner for examination, to clarify the cause of the disease, to be treated.