A cold sore is a very small blister that is filled with fluid and is caused by a viral infection, according to Mayo Clinic. It is also known as a fever blister. Cold sores are known to appear in groups, and it is common ... More »

Cold sores are mainly caused by the herpes simplex virus, or HSV, particularly the HSV-1 strain, states Mayo Clinic. Although rarely, another type of this virus known as HSV-2 also causes cold sores. More »

There is not a cure for cold sores, but the symptoms of cold sores can be treated, notes WebMD. Cold sore treatments include topical remedies such as Abreva and antiviral oral medications such as Zovirax, Valtrex or Famv... More »

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