If you see this appearing on your lips, it is a sign of ca….
Cold sores—also called fever blisters—are caused by herpes simplex virus type 1 (HSV-1). While they’re usually harmless, they’re contagious, often painful, and tend to reappear once you’ve had your first outbreak. That’s because HSV-1 never fully leaves—it hides in your nerve cells and flares up when triggered. What Causes Cold Sores? Most people catch HSV-1 … Read more