SurferJoe posted a good link. Check it out.
I had to fix some fret sprout -- which is what you're describing -- on my MIM Strat after I got it. Here's a quickie "How-To":
1. Use painter's tape (blue usually) to tape off the fingerboard and neck in between the frets.
2. Use a small triangular file for GENTLY filing down the fret ends, going in the direction of the grain. Take your time and file lightly.
But like I said, check the above link also.
