I hit my head several years ago as a kid, playing in the barn.. my parents didn t believe me when I told them it caused me to black out.. I had bleeding at the site of impact .. ever since I have had an dent in my head where I hit it, and it s always stayed sore, but just in the past year I have noticed a small knot at the back of the indentation and this knot is super painful.. like my children just lay their chin on it and I m almost in tears.. the knot is not very large .. but I have always wondered, even more so now, do I need to get it checked out or after all these years is it just in different healing stage/process???