The old feeling of dryness at the anal opening may be caused by constipation, perianal eczema, dry syndrome and other reasons. 1. Constipation: patients often have dry and hard stools, and may have a feeling of dryness at the anal opening when it is difficult to pass stools. 2. Perianal eczema: If perianal eczema recurs, it can cause local skin thickening and mossy changes, which may make the anus feel dry. 3. Dryness syndrome: If the glands in the anal area are violated, the phenomenon of dryness in the anus may occur. The old feeling of dry anus, it is recommended to go to the hospital in a timely manner, clear the cause of the disease, under the guidance of the doctor for standardized treatment, so as not to delay the condition of the body to bring adverse effects.