
Odds are, you have herpes. Two out of three adults under 50 have been infected with herpes simplex virus 1, or HSV-1, which causes those painful cold sores that form in and around your mouth.

Odds are, you have herpes. Two out of three adults under 50 have been infected with herpes simplex virus 1, or HSV-1, which causes those painful cold sores that form in and around your mouth.