Well, that's good news! Sounds like you caught it early.
The info the next poster gave is interesting, and totally makes sense. I don't know how you can keep if from recurring, but hopefully you can! Staph infections can get nasty. Luckily, no matter what, you are giving her a good home right now!
Can you clean it enough to make it bleed? Or do you think it's healing already? Does it smell? At least, with the help of gravity, it should drain well. Good luck!