I would be very interested in finding more about the PCR test and what would be a good time frame for a test like this. Is 10 days enough for PCR test to work. I also would like to know, should I be tested again. When can I know that I am HIV free, if my exposure was the last one listed below. Also an explanation for itchiness that I feel on my body. (Each time against my clothes it feels uncomfortable, itchy or a little scratchy). I was told that was anxiety, is that correct. Can a person get STDs/HIV through saliva by being lick on their skin? There was no cuts or other problems on my skin. At this time my skin feels very scratchy but I I am trying to avoid scratching it. The itchy skin occurs from my head to toe. I had a PCR test at 10 days after exposure and it came back negative. Do I have anything to worry about? I had all the other STD test and they came back negative. Is the skin around the balls weaker than other parts of the body? I would like to know why I am itching all over.