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Fever Blister vs. Cold Sore

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Rebecca in Austin, Texas, wonders why the terms cold sore and fever blister describe pretty much the same thing. Also, why do we say we have a cold, but we have the flu? The word flu comes from the Italian word for influence, influenza, and is a reference to an old belief that a contagious illness was influenced by celestial movements. This is part of a complete episode.

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