Perianal itch is caused by a variety of reasons, such as tight clothes, poor ventilation of clothing and other physiological factors, perianal eczema, hemorrhoids, rectal polyps and other pathological factors. 1. Physiological factors: daily if you wear tight clothes, or wear clothes with poor ventilation, may lead to poor perianal ventilation, perianal in a humid environment will breed bacteria, will cause itching. 2. Perianal eczema: perianal eczema is a chronic recurrent inflammatory skin disease around the anus, lesions in various forms, and there will be obvious itching. 3. Hemorrhoids: hemorrhoids are caused by congested and enlarged veins in the anal canal or the lower end of the rectum, with symptoms such as bleeding during defecation, anal itching, and prolapsed hemorrhoids. 4. Rectal polyps: rectal polyps are elevated lesions on the surface of the rectal mucosa, rectal polyps, if the volume is relatively large, the polyp will prolapse from the anus, which will lead to relaxation of the anal sphincter, and the intestinal fluids will flow out of the anus, which will stimulate the skin around the anus, resulting in itching around the anus. Itchy perianal area may also be parasitic infection, etc. If it is caused by physiological factors, it does not need to be treated by drugs, but timely self-adjustment. If it is caused by pathological factors, you need to go to the hospital as soon as possible to receive targeted treatment from the doctor.