Try going without any bottoms when possible. (I realize it's winter in most places, and this is not always possible, but when you are home, put on a long shirt, no underwear, and let the air get to it. Sit in front of a fan if you can.)
Try tea tree oil. DILUTE IT until you get used to it or your crotch will burn like fire. Wet a cotton ball and add a couple of drops of tea tree oil to the cotton ball, then dab it on the affected area.
Definitely wear cotton underwear as Clover suggested, and if you can, avoid pantyhose/tights.
It's going to be uncomfortable for several days. Are you on any meds? How long have you had the sores?
Take antiviral medications like Acyclovir and Valtrex can help. Some topical creams like Prosurx or Acyclovir are also effective in keeping herpes sores dry. Besides, you should wear cotton underwear to avoid irritation. Immeditaely keep the sores clean and dry after taking bath by a soft cotton towel, and don't forget to wash the towel.