question: my boys was wrestling and my 9 year old pushed my 6 year old and he hit his head on the window seal. Its on the back of his head there is a indentation, he cried for a few mins. i applied ice for 30 mins. asked him a bunch of questions gave him a snack, hes acting normal. But the indentation is still there and its been 4 hours. should i take him to the ER or call the doctor tomorrow?