Extra-anal anal fissure small ball may be anal papillary hypertrophy, anterior sentinel hemorrhoids, rectal polyps and rectal adenomas. 1. Anal papillary hypertrophy: anal fissure patients with upward infection, long-term stimulation of local tissues, resulting in connective tissue proliferation and the formation of anal papillary hypertrophy. The main manifestation is a smooth gray-white swelling, when combined with acute inflammation there can be a tingling sensation. 2. Sentinel hemorrhoids: mainly caused by chronic anal fissure recurrence, the patient will be in the perianal area there is a meatball-shaped swelling, in defecation, after defecation there will be more intense pain, and often have blood after stool. 3. Rectal polyps and rectal adenomas: If the rectal polyps and rectal adenomas are close to the anus, with the progress of the disease, the polyps and adenomas may prolapse out of the anus, thus forming a swelling. In addition to the above factors, we can’t rule out other causes, we suggest that the patient should consult a doctor in time, make a clear diagnosis, and carry out standardized treatment as soon as possible, so as not to delay the condition.