Hi, i wasn't sure where to post this, so I ended up deciding to post here. Just a couple of days a go, I noticed a ridge/dent in the back of my head, near the top of the back of my head. I've never noticed this before and so I wasn't sure if this was just something I hadn't noticed or if it could have sprung up in a matter of days. Also when i press down on this ridge/dent it can create a small amount of pain. I was just wondering if this is perfectly normal, or if something could possibly be wrong.