I'm guessing it's either because he is being physically abused by his dad (maybe hitting his stomach and causing internal bleeding) or by someone we have yet to know of, or because of some condition/disease (?) .
Here are some possible diseases/conditions/other that may cause rectal (anal) bleeding:
http://www.healthline.com/symptom/rectal-hemorrhage
Your hypothesis could very well be up there too...
I hope this helps! (●'◡'●)ノ
If I remember correctly someone said it's because he is being raped. As in the bleeding is because he is literally being ripped up down there..cause well it's rape so what does the rapist care about prepping him?
Same hopes. I don't want a bad ending for stories like these.
i dun get it..why he has period..is it becuz he was raped until he bleed??