The temple itself is an indent, but above that indent is not likely to be another indent. As the others mentioned go see a doctor and have them touch your head instead of expensive scans. If you are feeling it, they should too. A nurse should also be able to feel it and tell you if something is concerning and if you should schedual a visit with a doctor.
HN and other online forums with strangers are not equipped to give you good advice on your (apparently primarily mental) illness. Even if they say so.
Psychosomatics, paranoia, and maybe schizophrenia sound like your bigger issues to me but again, I'm also just a stranger on a forum you shouldn't really be listening too much to.
> in the homeless shelter at ...
Suggestion: Edit and remove this part while you can. No need to share your detailed location in public these days. I flagged your comment but more for your own sake.
Hopefully you will somehow get to see a good and caring doctor (psychiatrist?) that can help you align your inputs, outputs, and internal processes. Be well.
