Damp fart groove may be caused by poor hygiene habits or perianal eczema, anal fistula and other diseases. 1. Poor hygiene habits: If you usually exercise more, the body sweats a lot, or do not pay attention to personal hygiene, not wiping clean after the stool, it will lead to moist fart groove. 2. Perianal eczema: Perianal eczema is a chronic recurrent inflammatory disease that occurs around the anus, the cause of which is still unclear and may be related to the interaction of external and internal factors, such as trauma, friction, and heredity, mental stress. Patients will appear localized itching, erythema, blisters and other symptoms, if the itching is excessive localization will form vesicles, accompanied by obvious oozing. 3. Anal fistula: anal fistula is mostly caused by perianal or perirectal abscess, patients will be out of the perianal spontaneous pus as well as swelling and pain, resulting in a moist fart groove. 4. other anorectal diseases: common hemorrhoids, rectal prolapse, rectal polyps, rectal cancer, anal papilloma, etc., suffering from these diseases, the secretion of the rectal mucosa, due to the anus can not be completely closed, out of the anus, resulting in the place of moisture. There are more reasons that lead to moist fart groove, patients are advised to pay attention to personal hygiene and keep the local skin clean. If necessary, you should go to the hospital for examination, clear diagnosis and follow the doctor’s instructions for treatment.