Quote Originally Posted by Web MD
The virus that causes cold sores is common. Most people have been infected with this virus (herpes simplex virus, or HSV) by the time they reach adulthood.
Although most people have been exposed to HSV, only about 20% to 40% develop recurring cold sores.1 After a person becomes infected, the virus remains inactive in the body until it is triggered by something such as sunlight exposure or stress. When active, the virus results in a cold sore outbreak.
http://www.webmd.com/skin-problems-a...Topic-Overview

No, bio is not leveling. Not sure if this it what was causing Gabe's problem or not. It's different but related to the other herpes. People inveted names like cold sore and fever blister because no one wants to say "I have some herpes on my lips!".