Check out http://www.mgreptiles.com/MITEMAIN.html for mite treating stuff. I would suggest Provent-a-mite. You must keep treating them til' they are gone. Mites have an incubation time of a couple of weeks, so you may think you have killed them but you have not killed the eggs. If you did not quarantine your bp from you boa....most likely the boa has mites too...you just have not seen them yet.