Tea tree oil is great. You must have this in your medicine chest. If you are having an outbreak, it is very soothing and will remove the itch associated with Herpes. There is also some indication that tea tree oil my help break down the herpes virus, but the research is still inconclusive.
I highly recommend Tea Tree Oil be used in conjunction with liquid Licorice Root. If you are having an outbreak that includes blisters, first apply Licorice Root and then apply Tea Tree Oil. If your outbreak is extensive, avoid the licorice root as it will sting very badly, but the tea tree oil will help sooth it.