A red blister forms in a day or two, and it has to run its course and go away on its own. If you have had one Cold Sore, you have probably had many.
Cold sores affect about half of the population in America each year.
They consist of a fluid filled blister on a small red area and last for about 7-10 days. Once you have had a cold sore, or fever blister, the virus lies dormant in your system and is triggered by stress, illness, or exposure to sun. If you suffer from cold sores you may qualify to participate in an investigational research study. If you live in the Phoenix area, please complete the form below or call us. Radiant Research investigators have conducted over 5,000 studies across 16 therapeutic areas.