My guess would be simple hemmoroids or possibly an small tear from straining or too hard poops....especially if the blood is bright red and mostly on the toilet tissue or outside of the poop. Remember a few drops of blood will turn the bowl red, so it looks worse than it is a lot. Hemmoroids are not dangerous, adults get them more than kids but kids can get them. Especially if you don't eat great. (not enough fiber/fruit) I'd mention it to your doctor when you see him but try not to freak out. Red blood after a bowel movement is almost always hemmoroids. You can try a little preperation H ointment or even wipe a little vasoline after you clean up to soothe the area. Drink plenty of water as usual. Don't hold in your poop or force it out! Go when you have to. Holding it in or forcing it out to see if it's still bleeding will make it more likely to bleed. Relax. Sounds like hemmoroids. No biggie but do mention to the doc.
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