What Does An Indentation On The Forehead Indicate?

So I’ve had this indent on my forehead for a really long time but I have been told by my parents that it was normal. It goes from just above my hairline on the right side (a wide indent) and then it goes all the way down to my left eyebrow, shrinking in width. I’ve had it for years. But I also have focal seizures when I sleep at night too- for years. (It has just recently been diagnosed). I now have POTS that just started this year, and I don’t really know where it came from. Maybe mono? But my seizures tend to make my symptoms worse. I’m just wondering if maybe I got hit when I was younger and that caused this dent on my head. Cause when I push on it, it really hurts. In a weird way. I’ve also always had trouble sleeping at night since I was a kid. It used to be nightmares and paralyzed sensations. Then it turned into nightmares and seizures. How can I get this checked out?