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What do I do about this blister on my lip??

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I have a question. I've never had a cold sore in my entire life (I'm 24) and once I found out my husband was deploying the stress started piling on. I started developing a bump on my lip. Not at the edge of my lip but directly on my lip. I noticed it in the evening and kept watching it. The next morning it was a full blown blister. Not red or gross or anything, but like a blister you get when you burn your finger on a curling iron or something. Just barely touching it caused it to break and the clear liquid was drained. I just noticed tonight that I'm getting another one. The last time this happened was in October. Help??