my son has fallen off my bed around two feet tall when he was 11 months, a year ago. I have taken him to the doctor, they said he was fine, he may be falling and hit on the right side of the forehead. And now he is almost two, I recently discovered a small dent on his right forehead but it only appear when he smile or looking up otherwise it seem perfectly normal. Could this dent be from his old falling and shows up now, cause he have not fallen or gotten hit by anything recently. Will it eventually go away as he get older or not?. Should I take him to the doctor?