The patient’s anus is always moist, often due to the following reasons: first, external hemorrhoids: after suffering from external hemorrhoids, the anal part can appear moist and unclean, and at the same time will be combined with itching discomfort, you can go to the hospital general surgery, anorectal surgery for clarification. If the disease, you need to actively adjust the diet, such as try not to drink drinks containing alcohol, do not eat too spicy food, and do not eat pickled food, etc., can be appropriate intake of fresh fruits and green vegetables, and at the same time can be combined with drug sitz bath treatment, sitz bath solution is generally used diluted warm potassium permanganate water or Chinese medicine preparations, etc. Second, perianal eczema: usually can be localized rubbing erythromycin ointment or oil-based preparations to relieve symptoms. Third, the anal muscles are too loose: it is possible that the anal muscles are too loose caused by the intestinal fluid will flow out of the body, the local will be more wet.