Dampness and uncleanliness in the perineal area is most often due to anal incontinence resulting in the retention of fecal matter. Fecal incontinence is common in the elderly Mild forms of fecal incontinence often go unnoticed by patients and physicians The exact incidence is poorly reported. It is more common in elderly hospitalized patients and is generally more common in women than in men. What are the common causes of moist and unclean anal perineal area? 1, anal canal, rectum, colon lesions: the most common rectal tumors and inflammatory diseases, rectal tumor infiltration destruction of sphincter, ulcerative colitis, clonus disease caused by rectal inflammation long-term diarrhea, complete rectal prolapse caused by anal laxity, impaired pubic nerve traction. 2, anal, rectal sphincter injury: the most common reason is the anorectal surgery and birth injury, especially high anal fistula surgery to destroy the anorectal and sphincter, birth injury in the third degree perineal tear. In addition, internal hemorrhoids, anal fissure, rectal prolapse, faceted rectal tumors and other improper surgical treatment, or the anal canal tissues are subjected to external violence, drug injections, burns, frostbite, etc. can cause anal incontinence. 3.Neurological lesions: such as central nervous system diseases, spina bifida, spinal cord spinal bulge, spinal cord and sacral nerve injury, infection and spinal cord tumor. 4, other diseases: anorectal congenital malformation and anorectal nerve disorders can lead to anal incontinence. The causes of fecal incontinence are many, 1 or more causes can cause fecal incontinence fecal incontinence classification method has a variety of ways, according to the degree of incontinence, the nature of the rectal sensation and etiology of the classification, but also can be identified in Chinese medicine, but there is no uniform classification standards.