Cold sores are painful blisters caused by an infection with the herpes simplex virus (HSV). Learn more about the causes, risk factors, symptoms, treatment, complications, and prevention of cold sores.

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The symptoms of a cold sore include a tingling or burning sensation on the lips or around the mouth, followed by the appearance of small, fluid-filled blisters.

Cold sore-causing HSV-1 doesn't just hijack cells it reconfigures the entire architecture of our DNA to aid its invasion.