The pimples may be caused by internal hemorrhoidal prolapse, rectal prolapse, rectal polyps, etc. After defecation, the pimples may fall out. 1. internal hemorrhoid prolapse: due to the gradual relaxation of the anal cushion tissue, the anal sphincter tension decreases, the patient may appear after defecation internal hemorrhoid prolapse outside the anus. 2. Rectal prolapse: such as long-term constipation and other conditions can lead to increased abdominal pressure, pushing the intestinal tube to move down and prolapse. 3. Rectal polyps: If the rectal polyps are large and have tips, they can come out of the anus after a bowel movement. Those who fall out of the pimple after bowel movement may also be caused by anal papilla hypertrophy and rectal cancer. It is recommended that patients go to the hospital in a timely manner, a full body examination, a clear diagnosis and then follow the doctor’s instructions for treatment, so as not to delay the condition.