The anal verge is the edge of the anal skin, the location of the junction of the anal canal and perineal skin, the area where the anal canal epithelium and normal skin epithelium are formed. The anal margin is the outer mouth of the anus, can determine the distance between the rectal lesion and the anal opening, the main significance is the role of localization, is the specific location of the rectal anal canal lesion, the doctor to do rectal fingerprinting, anoscopy, enteroscopy, etc. will describe. Generally do not need to be able to understand the anal margin of a specific point, just the location of the outer mouth of the anal opening, there is no absolute boundary, different populations will be different, but will not be a large difference, generally will not affect the accurate judgment and positioning of the disease. Anal margin area may also have hemorrhoids and other diseases, if discomfort occurs, need to go to the hospital in a timely manner, the patient’s life to maintain hygiene, cleanliness, and develop good living and eating habits.