What are fever blister caused by?
…a fever blister is caused by a form of the herpes virus. There are two types of herpes virus. One causes genital herpes (although it can be transmitted sexually to oral tissue) and the other causes cold sores. The virus is very contagious, and according to this source, most people who have it are infected before the age of 10. Once you’re infected, you’ve got the virus for life. Most of the time it lies dormant, but whenever your body’s immune system is weakened (for instance, when you have a cold or a fever, or are under a lot of stress), the sores can erupt. So, now that you’ve got them, you’ve got a couple of treatment options. First, you’re contagious, so don’t share cups or utensils. Also, be sure to wash your hands before and after touching your sores to keep them from getting infected with bacteria. If you notice any drainage that’s not clear, try an antibiotic o
