Your lips feel swollen and tingly. But it has nothing to do with a romantic kiss you just shared (dang it!), instead you know it’s a sign. Red blisters are about to appear on your lip. Cold sores (or fever blisters) are caused by the type 1 herpes simplex virus and they’re highly contagious. They appear as small, red, and painful blisters on the outside of your lips, but they can also show up on your nose and chin. You can expose yourself to the virus by coming in contact with someone who has an active cold sore. Kissing, sharing … Continue reading →