What is "herpes simplex"?
Herpes simplex is one of the herpes viruses. Herpes viruses can live in nerves. The virus never leaves the body. It just becomes latent, and then, sometimes reactivated. When it is activated you'll get a blister or sore in the distribution of the nerve that's harboring the virus. When it's latent you won't see anything and won't even know that you have the infection.