Hi our 2 year old son bumped heads with his 4 year old sister a few months ago, we put ice on his bump & swelling went down, but has left a dent in his head. He s still the same, no changes in his normal activities as what we can see. We ve taken him to the doctors & doctor said its fine, but we re still worried. We haven t had a ct scan, should we? Could it be serious?