I don't have herpes myself, but after doing research for others, I found this and thought I'd share...

Here is an article presented by the American Society for Microbiology

http://www.webmd.com/genital-herpes/news/20030519/herb-may-be-alternative-herpes-treatment

here is a more 'herbalistic' article

http://www.raysahelian.com/prunellavulgaris.html

here's some on Lemon Balm (melissa officinalis)

by the University of Maryland Medical Center

http://www.umm.edu/altmed/articles/lemon-balm-000261.htm

and here's one, not a study, but an article by Medical Technologist, you can click on her bio...

http://autoimmunedisease.suite101.com/article.cfm/lemon_balm_in_autoimmune_disease

Just a few articles for general info.