I just saw it in the movie vampires. daniel baldwin put a lighter to his wound, after being bitten. was this a thing to prevent from turning into a vampire or does this help heal the wound or stop blood flow?
I think you're referring to cauterisation it's used to stop heavy blood flow to a wound, burning it would prevent infection, destroy damaged/diseased tissue and coagulate blood vessels.
Only a professional should be allowed to do this.