What is a Cold Sore or Fever Blister?
“What is a cold sore?” you may ask. Well, a cold sore or a fever blister is a red, painful blister that usually occurs around the lips and in the mouth. Cold sores are indicative of oral herpes, medically known as herpes labialis, which is in turn caused by the herpes simplex virus. It is one of the main dominating symptoms of oral herpes. This simply (and unfortunately) means that when you have cold sores in the mouth, you are 99% likely to have oral herpes.
