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Treating Cold SoresCold sores are caused by a type of virus called herpes which is contagious. They usually show up on the lips or the mouth as a cluster of blisters with a red base.
Study: People With Genital Herpes Can Spread The Virus Without Knowing They Have ItWorld wide, more than 530 million people have the herpes virus and according to a new report people who harbor the virus can be shedding it as much as 10 percent of the time, not even knowing they have it.