There are many causes of perianal dampness and itching, some of which are due to their own constitution and some are external manifestations of certain diseases, and the treatment of anal itching caused by different causes varies. The elderly or frail people The elderly or frail people have a relaxed anal sphincter or reduced contraction, which makes the anus close poorly, and the intestinal mucosa secrete intestinal mucus easily leaks out of the anus, especially in the case of exertion, the anus is moist and itchy. In this case, we should strengthen the exercise of the contraction function of the anal sphincter, such as lifting the anus under the hot water bath, sphincter stretching and contraction exercise, anal massage, acupuncture of Changqiang, Lumbar Yu and Perineal points, and taking the appropriate tonic of Zhong Yi Qi soup. For people with strong secretion of sebaceous glands and sweat glands in the anal area, especially for obese people, the anus is deeply sunken between the two sides of the buttocks, so that the perianal skin and sweat cannot evaporate well, causing dampness and local bacterial growth in the anal area. Attention should be paid to the cleanliness and hygiene of the anal area and to keeping it dry. Perianal skin diseases Suffering from eczema, herpes, contact dermatitis, condyloma acuminata and skin infection after abscess ulceration, etc., can cause perianal itching. Timely and reasonable drug treatment for various causes can effectively eliminate or reduce the lesions in the anus. The formation of anal fistulas after perianal abscesses or incision and drainage is also a common cause of anal dampness and itching due to repeated ulceration, pus flow and inflammatory exudation. Usually, anal fistulas cannot heal on their own and need to be solved by surgery. Prolapsed internal hemorrhoids In severe cases, the nucleus of the hemorrhoid not only prolapses during defecation, but also prolapses outside the anus even when coughing, straining, or walking, due to the contraction of the anal sphincter, embeddedness of the prolapsed hemorrhoid mass, edema, and increased exudate. After the hemorrhoid nucleus is prolapsed out of the anus, the hemorrhoid mass should be dragged back by hand in time, and after the local inflammation has subsided, medication or surgery should be applied. Rectal prolapse, also known as “prolapse”, often occurs when the anal sphincter is weak and the whole rectum or mucosa comes out of the anus, the rectal mucosal fluid will contaminate the perianal skin, and the perianal itching will be caused by increased secretion from the anal opening. If prolapse occurs, early surgery is recommended. The sequelae of anal surgery such as anal fistula and fissure surgery cut or damage more external or internal sphincter muscles, resulting in reduced anal closure ability and easy overflow of fluid from the rectum outside the anus. Prevention is important, and surgery should not damage or cut the sphincter as much as possible. Once it occurs, conservative treatment should be given first, and the contraction function of the anal sphincter should be exercised, and if necessary, sphincter repair or formation surgery should be performed. Rectal tumor Rectal cancer ruptures, infects with pus and blood, and the anal opening is always moist. Radical resection of the cancer is performed as early as possible.