Have A Lump/ Scar on my finger!

Well I was playing field hockey when I fell, and when I feel, a bit of a deep part of the skin of my finger came off and ever since, it has healed in the form of this weird lump. I've had it for about 6 months and my mom's always telling me to stop biting it, but it is really annoying and it sometimes makes me self-conscious. I have to hold my pencil in a way were no-one can see it, I have to make sure my middle finger it covering it at all times.
It is really nasty to me and I'm hoping it's not a permanent scar. Is there anything I should know about it? Will it heal in it's own time? Can I get an operation on it?
ANYTHING!! ;D

Thanks xx