Cold sores are painful blisters caused by an infection with the herpes simplex virus (HSV). Learn more about the causes, risk factors, symptoms, treatment, complications, and prevention of cold sores.

The valacyclovir dose for cold sores is different from the dose for herpes, ... This can help cool off painful cold sore ...

Here’s what causes colds to spread so easily, how long they are usually contagious and how they’re most commonly treated.

The symptoms of a cold sore include a tingling or burning sensation on the lips or around the mouth, followed by the appearance of small, fluid-filled blisters. The blisters may be painful and can ...

A new COVID variant called "Nimbus" is spreading. Here's what you need to know about the incubation period, symptoms ...

Cold sore-causing HSV-1 doesn't just hijack cells it reconfigures the entire architecture of our DNA to aid its invasion.