If you have stinging it could be a fissure, or yeah, a hemorrhoid. I get fissures occasionally and there is SO MUCH BLOOD at times it's downright horrific. It looks worse than the worst days of my period, and I have pretty heavy periods. Once I had to sit with toilet paper pressed against it until it stopped bleeding and there was a big clot left behind. These things can bleed like crazy.
I never worried about it though because the tearing sensation and pain are pretty obvious when I have them, so there's no doubt where it's coming from!