I watch my snakes when feeding live if I get a rascal that fights back I usally just Pinch with tongs although I have had an instance where I had to thump the mouse in the head while the sanke was constricting lucky enough he just thought the mouse was freaky and crushed harder. Either way I would do it again if I had to.

Anyway I dilute a light solution of betadine in water unlit it looks like watered down tea. I use a q-tip and rub on affected area. After that I apply non pain relieving neosporin. Hope this helps...