A cold sore is a blister that forms on or around the lips and is usually caused by the Herpes Simplex Virus, usually Type 1.

Most cold sore sufferers aren't exactly sure when they first encountered the virus because Herpes Simplex Virus is usually contracted early in childhood.

Unfortunately, once the virus is contracted, it remains dormant in the body in a nerve located near the cheekbone.

During a cold sore outbreak, which often occurs after you have experienced one of the cold sore triggers, the virus "wakes up" and infects the skin cells in or around your lip or mouth, eventually becoming a visible and contagious sore.

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