There are a lot of patients call to consult, said around the anus is always wet, do not know what is the reason, in fact, anal damp is a normal physiological phenomenon, but there are some abnormal, if the damp is more serious, with itching, as well as increased secretions, which may be anal pruritus, may also be accompanied by some other anal diseases. The anal dampness may be caused by the following diseases: 1, prolapsed internal hemorrhoids: it belongs to the anal disease hemorrhoids, in serious defecation will have a foreign body prolapse, even walking, running, coughing may be prolapsed outside the anus, and due to the prolapse of the anal foreign body will cause edema or exudate increase in the anal area thus leading to anal dampness. 2, anal fistula: is from the anal canal and rectum around the occurrence of abscesses after breaking, due to the flow of pus, inflammatory exudate too much can also lead to anal dampness. 3, rectal prolapse: it often occurs in the anal area, due to muscle relaxation and weakness, the rectal layer or mucosa out of the anus, the rectal mucosa surface fluid will contaminate the skin around the anus, resulting in anal dampness produced by excessive secretions from the anal opening. 4, anal skin diseases: for example, the skin around the anus eczema, dermatitis, etc. and skin infection will appear after the pus, to be pus rupture will produce excessive secretions resulting in anal dampness. 5, after hemorrhoid fistula: traumatic inflammatory secretions and intestinal fluid along the scar depression, there will be a slight anal dampness; if there is damage to the anal sphincter, a large amount of intestinal fluid overflow or even fecal retention and serious dampness; such as surgery resulting in anal canal skin loss, intestinal mucosa exposed, the intestinal mucus can be overflowed to cause dampness around the anus. Therefore, if more serious anal dampness or other symptoms occur, go to the hospital for further examination and treatment in a timely manner.