Chicken pox would appear all over your body - shingles, a reactivation of the chicken pox virus would be possibly localized but would also tend to be painful. A condom is your best protection agains herpes, however it is not 100% protection against catching herpes, expecially if your partner is having a reactivation of the virus at the time of sexual activity. If the rash persists, I would get a second opinion from another doctor - preferably a dermatologist.