Cold sores are small blisters that develop on the lips or around the mouth. They are caused by the herpes simplex virus and
usually clear up without treatment within 7-10 days.

You will not have any symptoms when you first become infected with the herpes simplex virus. An outbreak of cold sores may happen sometime later.

Cold sores often start with a tingling, itching or burning sensation around your mouth. Small fluid-filled sores will then appear, most commonly on the edges of your lower lip.

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