This is a fairly common problem, and as it has been stated, it is likely contributed by the various cuts. If neglected, this minor soreness can turn into a serious inflammation characterized by a very sore throat as well as pimple-like growths in the nasal cavity. If you experience any of these symptoms you need to stop snorting as soon as possible. If you let it get out of control, I promise you will regret it. I know a guy who had this problem... To this day, if he snorts a small amount of anything, the painful pimple-like soars return instantly, and they take forever to go away.
This guy was avid about letting people know about this situation. Heres a tip, pre-dissolve the stuff in water and spray it into your nose with one of those nasal inhaler squirt bottle thingies. Either that or, after you snort, run some tap water over your hands and sniff a few drops of water off your finger tips. Seriously, this seemingly minor irritation can grow into a major problem.