I would try to find the right answer from a doc. I could be wrong but never of drug use pushing a bone out of head. The fact you are still having memory issues is concerning
yes I've been to a clinic years ago he said he thought if felt like bone. It is oval shaped. No it hasn't gottin bigger. I remember reading an article in a magazine that mentioned this same kind of bump with people who have used to much dope. I have had my family dr. Look at it to he raised is eye brows but said nothing.
Have you been to ther doc for the bump. is it gotten bigger what kind of shape is it.