Roll your tongue around your mouth, and you might feel a ... associate professor of oral medicine at Harvard School of Dental ...

But many people get cold sores that come back. Cold sores, or fever blisters, are groups of small blisters on the lip and around the mouth. The skin around the blisters is often red, swollen ...

How Are Cold Sores Diagnosed? To see if you have the herpes simplex virus (HSV), which causes cold sores, your doctor may simply examine the cold sore or may take a culture from it. The doctor may ...

Leib, Ph.D., Chair and Professor of Microbiology and Immunology at Dartmouth Geisel School of Medicine ... ganglion to the edge of your lip, although sores can crop up elsewhere, like the roof ...