1, the elderly or frail, the anal sphincter muscle relaxation or contraction force is reduced, so that the anal closure is not tight, intestinal mucosa secretion intestinal mucus easy to leak out of the anus, especially in the case of exertion, the anal damp more significant. For the above situation, we should strengthen the exercise of the contraction function of the anal sphincter, such as the exercise of lifting the anus under the hot water bath, the exercise of sphincter stretching and contracting, the massage of the anus, the acupuncture of the long strong, lumbar and perineal points, and the appropriate taking of the tonic of Zhong Yi Qi soup, etc. 2, the anal sebaceous glands, sweat glands secretion, especially the body type obese, the anus is deep between the two sides of the buttocks, so that the perianal skin sweat can not be well evaporated, resulting in the perianal often damp, should pay attention to the anal area cleanliness and hygiene, and keep dry. 3, perianal skin suffering from eczema, herpes, contact dermatitis, acral warts and skin infection after the abscess broke, etc., can cause increased local secretions in the anus. Timely and reasonable drug treatment for various causes can effectively eliminate or reduce the anal lesions. 4, anal fistula formed after perianal rectal abscess breakage or incision and drainage, due to repeated breakage, pus flow, inflammatory exudate more, is also a common cause of anal dampness. Most of them require surgical removal of anal fistula to cure. The hemorrhoids are not only prolapsed during defecation, but also prolapsed outside the anus when coughing, straining or walking. Due to the contraction of the anal sphincter, the prolapsed hemorrhoids are embedded, edematous and the exudate increases. 6.Complete rectal prolapse: It often occurs when the anal sphincter is weak and the whole rectum or mucosa comes out of the anus, and the rectal mucosa shows fluid that will contaminate the perianal skin and lead to increased secretion at the anal opening. Surgical treatment is appropriate. 7, anal surgery sequelae, such as anal fistula, anal fissure surgery cut or damage more external sphincter or internal sphincter, resulting in a decrease in the ability to close the anus, rectal fluid easily overflow out of 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 carried out first to exercise the contraction function of the sphincter, and if necessary, sphincter repair or formation surgery should be performed.