What is its colour ? Bright Red or Dark blackish ?
I had blood once same on just the toilet paper, stark red coloured. It was because I had overdosed imodium and it constipated me. To get things out I started pushing super hard whoch eventually led to blood coming out. When I talked to my surgeon about it he said the straining can very easily cause little blood to ooze out. He advised me to make sure I relax myself everytime I sit on the toilet seat. Let the pressure build up. But if its not bright red it could be coming from upwards. Anyway you should start using a paste in that area to treat any fissure, I use sudocrem to keep it in a good condition. Also keep a count of your iron levels. Pouchers can get iron deficient very soon.