In a warm moist environment with skin irritation, yeast can grow. Did that answer your question ?
Once again the herpes forum is where you should post your question since it is specific to herpes. Please post it there for much much better answers to your questions by people who have been diagnosed and specialize in herpes.
http://www.medhelp.org/forums/Herpes/show/195
I have never heard of that happening though.