Cold Sores - Symptoms

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Cold sores are blisters on the lips and the edge of the mouth that are caused by an infection with the herpes simplex virus (HSV).

Cold sore blisters usually break open, weep clear fluid, and then crust over and disappear after a few days.

Other symptoms may include:

A sore mouth that makes eating, drinking, and sleeping uncomfortable. Cold sores can be painful.
A fever.
A sore throat.

Swollen lymph nodes in the neck.

Drooling, in small children.