Should you be worried if you hit your head and now have a small lump on the side of your forehead?
No. When a person gets a hard enough "bonk" swelling will
result. It is always a good sign if you get knocked pretty hard
that you have a bump, because that is an obvious way of telling
that your head is healing... If you have sight problems (blurry
vision) nausea and/or vomiting, dizziness, or other of these type
of symptoms you should get checked out.