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They are caused by the herpes simplex 1 virus. We get them by being infected by someone else who is sheding the virus - probably being kissed by someone when you were very small. Once infected with the virus you may have periodic outbreaks or the virus may remain dormant. No one really knows what causes the virus to migrate and reproduce but is has been linked to stress, infections, menstruation, hormone changes and certain foods. Generally the advice not to pick at your cold sore is good, if you get virus particles on your fingers you can spread them to other warm moist parts of your body and cause more infections there, or you could pass them on the other people. It is also a good idea to dry your face with paper towle when the cold sore is active. That way the virus particles can be disposed off and won't come in contact with your eyes.

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15y ago

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