Cold sores are common, and they can sometimes appear under the nose. Learn about the symptoms, causes, treatment, and prevention of cold sores under the nose.

Cold sores are small blisters that usually appear around the mouth. Find out how long they last, the stages of healing, and treatments that may help.

The virus that commonly causes cold sores starts reshaping our genome within an hour of infection to boost its own growth, which scientists could take advantage of to treat severe cases.