Cold sores and fever blisters are absolutely annoying. Another word associated with them is unsightly. The cause of sores is herpes simplex virus. Cold sores generally appear if your mouth might have had contact with herpes virus in childhood. What happens after this is that the virus finds a host cell to move into. After this, the nerve that is attacked works as the virus tells it to. So you suffer from cold sores and fever blisters.

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