These bumps can be skin warts, hemorrhoids or benign or malignant growths of rectum. Hemorrhoids are varicosities and inflammation of veins in the rectum and anus.They are caused and increased by increased straining during bowel movements, by constipation or diarrhea,hypertension,obesity, excessive consumption of alcohol or caffeine and portal hypertension.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.