You really shouldn't be bleeding doing it so infrequently. When you snort, do you make sure there isn't any drug residue or pieces left stuck in your nose. Also, make sure the drug's been crushed into pure powder. That way there's less of a chance chucks will get stuck up there to do damage to your nasal lining. Lastly, once it's been awhile and you aren't going to do anymore, make sure you rinse out your nose to make sure there's nothing sitting up there. I really don't know what else to tell you. I've been snorting for years on end and I have yet to have a bloody nose from doing it. So, I suppose it's possible you did nick yourself. Try not to be so rough placing the straw up there. Good Luck!