When the anus out of a circle of meat, may be due to ring external hemorrhoids, rectal polyp prolapse, anal papilloma and other diseases caused by the cause. 1. Circumferential external hemorrhoids: in general, the anus out of a circle of meat, the most common is caused by hemorrhoids, especially circumferential external hemorrhoids, if there is a dry stool, defecation will usually make the external hemorrhoids out, aggravate the edema, the anus out of a circle of meat when the stool phenomenon. 2. Rectal polyp prolapse: may also be the lower end of the rectum polyp prolapse caused by the polyp with defecation, especially the polyp development of the larger, the situation will be more obvious prolapse. 3. Anal papilloma: this kind of patients may have the above phenomenon, and anal papilloma in a relatively small time almost no symptoms, when grow to a certain extent, will be with the stool out of the anus, mild can be returned to the back on their own, severe need to be returned to the back of the patient’s hand. Therefore, it is recommended that patients should go to the hospital for a detailed examination to identify the cause of the disease and then carry out targeted treatment to avoid delaying the condition.