Re: MRSA staph infection?
Okay, small wart scab like things could be just about anything, from actual warts to chicken pox to just dry itchy skin.
Staphlococcus aureus, or staph, is a bacteria that causes infections. Boils, for example, are very often caused by staph. If staph bacteria get into a cut, you could get a wound infection. If the infection spreads to your bloodstream, organs, or bones, then you've got a pretty bad situation, but that is uncommon. MRSA (methicillin resistant staph aureus) is a particular strain of staph. It causes the same types of infections as regular staph, but many antibiotics (including methicillin) won't cure it, only a few will. A doctor can identify a wound infection just by looking at it, but only a lab test can tell whether MRSA is the cause.
Tattoos and sex could spread staph, but there are many much easier ways of catching it. Pretty much any direct (touching) contact could conceivably spread it, or even indirect touching. In fact, staph is pretty much everywhere, including in everybody's house right this minute. Hospitals, unfortunately, are a major source of staph infections.
Some people just get recurrent boils. It's believed to be more related to their skin or immune system than any particular infection they have.
About your scabs? I wouldn't be too worried. If it bothers you, ask a doctor, or maybe some sort of cream or ointment would make them go away.
If you do develop any kind of skin or wound infection, however, make sure the doctor does a sensitivity culture and you get the right antibiotic for your infection. This is a suggestion I give anyone worried about MRSA for any reason.