Yes, anything cold will bring down the swelling.
To sign 'YES' make a fist with your hand and move it up and down, much the same as nodding your head. To say 'NO' it is the same, make a fist with your hand and shake side-to-side, like you are shaking your head.
A blow to the head would cause swelling.
My head is swelling if you know what I mean...
No.
If it's really just a bump on the head, I'd ice-pack it. 30 minutes on/ 30 minutes off would be good.
Head First
Do not take a bump on the head lightly, it can be deadly if a blood clot or internal bleeding is there. .Any bump that causes unconsciousness should be looked at by a Dr. if the bump is minor it should start to go down on the second day but may still be tender for a week or more.
Well first put ice on it, that will keep the swelling down. Keep the ice on it until its gotten like not really hurting to much, and the swelling has gone down somewhat. Don't take the ice off if they're still crying.
A back tooth can cause swelling at the back of the head. This is especially true if your back tooth is infected.
encephalitis.
It will usually only take about one day in order for the knot to go down. You should put ice on the knot to help reduce the swelling.