What Is a Cold Sore? A cold sore is a group of tiny, painful blisters caused by the herpes simplex virus (HSV). They're also called fever blisters or herpes simplex labialis. Up to 90% of people ...

Cold sores form clusters of fluid-filled blisters that often burst and ooze. Pimples on the lip line are red bumps with whiteheads, not blisters. Cold sores are contagious, but pimples are not. Cold ...

Experts explain what they do, and don’t, recommend. Ask Well Experts explain what they do, and don’t, recommend. Credit...Joyce Lee for The New York Times Supported by By Erica Sweeney Q: I get cold ...

Cold, dry weather can cause lip irritation, cracking, and cold sores. Blistex offers several over-the-counter products to treat cold sores and moisturize lips. Using antiviral creams at the first sign ...