Cold sores form clusters of fluid-filled blisters at the lip line that can tingle. Pimples on the lip line are red bumps with pus whiteheads, not blisters. Cold sores are contagious, but pimples are ...

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, 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 ...