What are Cold Sores?

Cold sores, also called fever blisters, occur most commonly when immune systems’ strengths are weakened by fevers or colds. These fluid-filled blisters erupt on the face, most often near the nose and chin, and they can cause flu-like symptoms. Once you’ve been infected with the herpes simplex virus type 1 (which causes cold sores), the virus remains in your body... read more »