Cold Sores: Cold sores are caused by herpes simplex virus (HSV). There are two types of herpes simplex virus HSV-1 and HSV-2. Cold sores are groups of small blisters on the lips and around the mouth.The blisters may break open, leak a clear fluid and then scab over after a few days. They usually heal in 2-3 weeks. Both virus types can cause sores not only around the mouth (herpes labialis) even on the genitals (genital herpes) also.
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