What should i do ????

There is this boy at my school and he is really mean. He never leaves me alone. The thing is that I have this very small bump on my nose, and he never lets me forget it. He always calls it a road bump and makes me feel like I want to cry. Everyone is calling me road bump now. I don’t want to say anything to the teachers because then he will call me a snitch, but I don’t wont to tell him to stop because I tried that and it just got worst. So what should I do????