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Cold sore

Cold sore, skin lesion, generally of the lips or nose, caused by the Herpes simplex virus. Often characterized by blisters filled with a clear liquid, cold sores may be triggered by infections such as the common cold or pneumonia. The virus frequently becomes dormant, persisting in the skin between attacks.

See also: Herpes.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Clyde to Constable, John