My Nasal Swab Came Back Positive for Staph – NOT MRSA – What Does This Mean?

What does this mean? I have a red spot that has gotten a little bit larger over the course of a couple of weeks (about the size of a dime – though not circular). No blisters seem apparent. No pus. Barely raised. Saw a doctor. She prescribed Kefex, which I'm just now starting. However, while at the doctor's I requested a nasal swab just to be sure to help rule out MRSA, as my elderly dad has been in and out of the hospital and DID have MRSA and I spent a lot of time at the hospital with him. The doctor said my skin infection couldn't be swabbed because there's no liquid in it and she didn't feel there would be enough cells. Nonetheless, she said if it were MRSA after 2 week's time it would have rapidly proliferated and and would be weeping or have pus. She said it doesn't appear to be any MRSA she's ever seen before and not to worry. I prefer not to ingest meds if I don't have to so she said I could try triple antibodic ointment first before the Keflex, but my sore didn't respond. I just started the Keflex today. My nasal swab came back positive for Staph – NOT MRSA. She was quick to add the Staph in my nose is the same type of Staph that lives on "everybody's skin," so no worries. She told me the Keflex would take care of it. She seemed completely unconcerned and quickly got off the phone. Questions: 1) How does Staph get in your nose to begin with? 2) How would oral Keflex kill the staph that's in my nose? – I know it's suppose to clear up the skin infection though 3) How concerned should I be having tested positive for Staph in my nose? I realize in the research I've done this is pretty common place, but if the Keflex doesn't kill it, what could this possibly lead to? 4) Am I contagious? 5) Should I get reswabed after taking the Keflex? 6) Should I get my skin infection biopsied just in case? Thanks for any guidance on this one!