What causes rectal bleeding?

Rectal bleeding is common (especially in women). If it is bright red, and if it is not vaginal, it is external - and of no medical concern. People have hemorrhoids, small fissures, pimples, and many external (or anal) bleeds. They heal. My advise is simple do not irritate the region. Treat the area gently - as if it were diaper rash. Wipe it gently with an unscented baby wipe (always wipe from front to back).