Hello, I blacked out from drinking too much last September and ended up hitting the back of my head against the wall. The next morning I woke up and found a little dried blood. I had a minor concussion and eventually the bump size reduced greatly, but it is still there as of now - February. It hurts a little from time to time. I'm not sure why it hasn't gone away entirely, it seems to be a hard bump the constant size. Is this normal part of a slow healing process or is it something more serious?