The human anus at the hair, hair follicles or sweat glands are more abundant, and the part of the hygiene and cleanliness than other parts of the body to be poor easy to breed bacteria, and most people are sedentary for a long time, less movement of the local blood circulation is slower, long-term may occur around the anus skin and deep tissue lesions, especially susceptible to long folliculitis, herpes, boils, carbuncles and so on. Repeated skin inflammation stimulation of stratum corneum hyperplasia leads to the anus is easy to grow polypoid lesions, especially with hemorrhoids, proctitis, hide hair sinus or perianal lesions around the anus is easy to moisture, long-term easy to lead to itchy skin. In addition, hyperplastic lesions of polypoid tissue can also irritate the nerves around the anus causing itching in the area. This condition is usually seen in the elderly, immunocompromised, immunodeficiency, long-term bedridden people to prevent this symptom, need to keep exercise to ensure that the anus hygiene clean and dry.