Cold sores, also known as fever blisters, are painful infections that show up as blisters mainly on the lips (not to be confused with canker sores, which are only on the inside of your mouth). These nasty little guys are caused by the herpes simplex virus (HSV-1). For context, HSV-2 is what causes the STD genital herpes outbreaks. Cold sores are also very contagious and can spread to other parts of the body such as the lips, cheeks, eyes, and, yes, the genitals. Want to boost your immune system to prepare for fall? You can start with your gut bacteria. A cutting-edge nutrition deep dive taught by 20+ top health & wellness experts
