bone in gum

3 years ago i have pulled up one of my teeth . i remember it was very hard to pulled it up.
and now i have like a bone in  my gum in left lower part of my teeth.
it's very hard like a stone,approx. 1 cm. it's greater and greater in the last several months.
My teeth is  not normally stand now, go to the inner of my mouth.
I have no pain with this (Jaw, Gum or teeth) but i scarred it'll growth up 4 ever.
My question is what 's this and what i have to do?
i 'm waiting your answer as soon as possible. tanks.
from me : faizal , indonesia

[scottma]

if the swelling is symmetrical, it may well be torus mandibularis.if it's only in the left side, you need to see an oral surgeon.