A fever blister is a small blister or group of blisters that usually develop on the lip or around the mouth. They are triggered by infection with the herpes simplex virus. People are usually infected in youth or young adulthood, and the infection persists for life. Around 90 percent of adults have herpes simplex antibodies in their bloodstream, which means that they have been infected with the virus at time. The first infection does not usually cause any symptoms. One-third of contaminated people experience cold sores, which are a reoccurrence of the earlier infection and do not indicate recent infection. The majority of these people would not have experienced symptoms from the first infection. For some people contaminated with HSV, the first infection can cause symptoms. These can consist of: fever; tiredness; sores and ulcers in and around the mouth; swelling; pain inside the mouth and on the gum tissues; an aching throat; puffy neck glands. The symptoms can last as much as 14 days and may cause dehydration, specifically in children, because it is agonizing to ingest. Primary infections are more probable to be serious in newborns, people with atopic dermatitis and in people whose immune system is subdued.
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