Dear, HERPES causes blisters and sores around moth and genital organs. While MRSA causes skin infections. HERPES is spread from viruses while MRSA spreads from bacteria. Ask your Wife to consult doctor as soon as possible. The diagnostic of both diseases is very simple. I don't know on what basis your wife's doctor is confusing with boles and blisters. Just change your doctor and carry out a detailed check up.