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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 »

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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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 »

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 »

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 »

The Mayo Clinic lists the causes of bags under the eyes as age, heredity, fluid retention and allergies. Bags under the eyes are generally not a medical concern, but for most people, having puffy bags under their eyes is... More »