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What's the best Cold Sore medication out there?

Just got a cold sore this morning. It's the first one I've had in years. I used to use Zilactin which created a gross film over the sore and made it look worse than it was (although to be totally honest, a cold sore always looks terrible). This time, I bought a tube of Abreva. It was twice the price of the other creams and I'm skeptical that any of the creams ever do anything... but at least it doesn't form a film and it rubs in clear. Thoughts?

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