Does Vancomycin Cause Body Rash?

Hi Doctors My father is 70+ yrs old, recently 4 weeks ago doctors Diagnosed that has Staphylococci on heart valve while inflammation was reached to 1200 , doctors giving him 2 vein injection daily(Vancomycin) and after 4 weeks inflammation reached 113, my questions are: 1-What are the degrees that inflammation has to reach that allow us to stop the medicine? 2-yesterday his body get rash every where, is it from the medicine (Vancomycin)? 3-Does Staphylococci can be retrieved (come back again)?