Looking for some advice.

Let me start off by saying, I love this subreddit. I've learned a lot, and I'm always up to date on events and happenings in the world of Brazilian Jiu Jitsu. Now for my question. I'm not sure how, but it seems that I have a possible (key word possible) staph infection. I caught it early, and I've picked up some antibiotics and an ointment and doc said should be gone by 2 to 3 days. While I'm happy for that fact, I'm wondering how this might have happned and what I can do to prevent it. Please note that I am a VERY clean person, I shower at the end of every practice, and keep my gi and my clothing (for when I roll no gi) clean. Is there anything else I can do?

Update: So I got meds from the doc. Been taking the anti biotics and the swelling has decreased and pain is slowly subsiding. But I'm getting kind of stir crazy. I can still do push ups, pull ups, and kettlebells, but since its on my leg, I'm wondering: can I/should I run? Also, thanks to everyone for their adivce. I've used the vinegar to wash my gi's and I let my coaches know.