What Causes Blood In Stool?
Information
Detailed Answer:
Hello and welcome,
Blood on the surface of stool rather than mixed in is usually means that the bleeding happened near the end of the gastrointestinal tract, such as from a rectal tear from passing a large or hard stool, or from hemorrhoid irritation. Less common in someone your age (and presuming no colon cancer in a first degree relative) would be a growth in the colon. It can also happen from inflammatory bowel disease, but you didn't mention any symptoms that would indicate that.
I recommend you go in to see your primary care doctor who can do an exam of the anus and rectum to see if there are obvious causes for the bleeding.
If there is more concerning family history, or no evidence of abnormalities of the anus or rectum (such as a visibly irritated hemorrhoid), then your doctor may want you to have either a flexible sigmoidoscopy or a colonoscopy. I have had colonoscopies because my sister had colon cancer, and I can tell you that the prep is unpleasant but the actual procedure is not because you will be out, and will not have discomfort afterwards.
I hope this information helps. Please let me know if I can provide further information.