There is a meatball in the anus need to consider the following aspects of the cause: 1, internal hemorrhoids prolapse: the vast majority of the population have internal hemorrhoids, internal hemorrhoids of the I-II stage is mainly bleeding as a symptom, III-IV stage is mainly prolapse as a symptom, serious cases of internal hemorrhoids dragged out and can not be retracted on their own, and therefore may be mistaken for a small ball of meat, in fact, it should be the prolapse of the internal hemorrhoids; 2, external hemorrhoids: when the severity will be The more big, usually long in the position of 3 points, 7 points, 11 points; 3, thrombosed external hemorrhoids: mainly have blood vessel rupture and lead to: 4, sexually transmitted diseases: such as condyloma acuminatum, usually lead to have a skin flora and there are more than one, mainly sexually transmitted as the main mode of transmission.