My son had a pretty good knock to the head...didnt need stitches, but it swole up like a golf ball. Once it healed there was still a bump...I asked the Dr about it and he said it was scar tissue and that it may or may not go away, but there was nothing we could do about it. It did finally go away, but it took about 6 months (and now he has fallen again on the same spot!! boys!). So, I would let your Doc look at it next time your in, just to make sure all is ok...then just try to be patient...it will most likely go away, just might take a while.