take it to the vet
get rid of the hamster or buy a cage for it!!
try putting salt on your sore.
No.
If it's all ready broken into a sore then you're probably not going to get rid of it in 30 minutes. Apply some ice to the sore then some cold sore cream.
How do you get rid of open sores that been there almost a month.
by owning one and holding it a lot (that's how i got rid of my hamster fear)
With a knife.
Don't torch it!
you should. the hamster may be gone but the cage will start to stink.
buy a new hamster
Because when it bits the cage it could get red on top of it.
take it to your vet or got to a local pet shop or where you got it