What is the cause of a small amount of blood being on the tissue after a bowel movement?

Find out for sure what it is. Hemorrhoids, Polyp, Ulcer, are just three of the possibilities. Some things are minor if checked out in time but can be much more serious if left unchecked. I liked the webmd site for getting more information. See the Doctor now. The above poster gave you good advice, but there also fissures (small cuts in the anus) that can cause bleeding, but any bleeding during or after a bowel movement should be diagnosed by your doctor.