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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 »

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 »

According to WebMD, cold sores are caused by the herpes simplex virus, which is contagious. The virus is contagious via direct or indirect oral contact, which means that it may be spread by kissing, sharing cups or utens... More »

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The Mayo clinic states that cold sores are caused by the herpes simplex virus. This virus spreads through skin-to-skin contact, such as kissing and oral sex, as well as by sharing razors, eating utensils or towels. Once ... More »

According to WebMD, cold sores are caused by the herpes simplex virus, which is contagious. The virus is contagious via direct or indirect oral contact, which means that it may be spread by kissing, sharing cups or utens... More »

Research links Bell's palsy to several viral conditions, such as mononucleosis, chicken pox or shingles, and cold sores or genital herpes, although the exact reason it occurs remains unknown, according to Mayo Clinic. Th... More »

Cold sores form on lips because of an infection by the herpes simplex virus, which gets into the body through a cut or scratch in the mouth or nearby skin, WebMD states. Contact with a cold sore or with HSV-infected flui... More »