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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 »

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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 »

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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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Cold sores are always contagious, according to Mayo Clinic. Even if you do not have an active cold sore but are infected with the herpes simplex virus that causes cold sores, or HSV-1, you can transmit the virus that cau... More »

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According to How Stuff Works, it is important never to pop a cold sore, as this causes the fluid inside to be expelled, spreading the germs causing the cold sore. Allowing a cold sore to heal on its own or with the assis... More »

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Shingles is defined as a viral infection that causes a painful rash, according to Mayo Clinic. The shingles virus is caused by the same one that causes chickenpox. Shingles isn't a life-threatening disease, but the rash ... More »

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Shingles is a viral infection that affects a small portion of the body, resulting in pain, burning and numbness, followed by the appearance of a red rash after a few days, according to Mayo Clinic. The rash eventually fo... More »

www.reference.com Health Conditions & Diseases Skin Conditions