Bone build up???

[Trish]

I fell about 3 months ago, landed right on my tailbone. Luckily I didn't break it. But about a month after I started to notice there seems to be a bump, or bulge now growing there. Its now about the size of a half dollar, and doesn't seem to be slowing down. It is uncomfortable to sit on anything hard, even to sit in the bathtub. My question is what could be causing this, and is this something I should be worried about?

[Dr. Joshua]

Any sort of growing bump or lump is worth showing to your primary care physician - impossible to say over the internet what it could be.