When I was 4 years old I was hit on the right side of the head by a swing in a play park. My brother had been messing with the swings and I have no idea where my dad was. My father took us home shortly after this took place, but he never got me checked out by a doctor - he was more concerned with covering it up so that he would not be in trouble with my mother! I do remember at one point my head was bleeding. I am now 36 years old, and recently the right side of my head has been painful a lot. I do have an indentation on this side of my head - which I put down to this incident. My hair covers it, but I can feel it if I fun my fingers through my hair.
The injury has not really been a massive problem - I would occasionally get a bit of pain there. But over the last few weeks it has been painful a lot. It feels like I am being hit at the side of my head.
Is this normal for old injuries to suddenly become painful like this and how can I make the pain go away? Should I be worried?