?

I've noticed bruising along my spine over two years ago, never put any thought to it. But recently (I sleep on a bunk bed, lower bunk and I tried getting out of bed and I hit on the upper bunk) I had hit it and hurt more than it should have, so I went to go look in the mirror and noticed that it had gotten worse. This was the only time I ever really paid any attention as now that it's rather large (I'd say about 4.5 inches it goes up my spine) I've gotten a little worried.

Any possible things that could be causing this?

I'm a fourteen year old kid and I really don't want to have a back injury this young. :/

I'm looking for a website like Gaia Online/Solia Online. However, I want newer websites like them. Any ideas?