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A member asked:

Hi, i developed what i believe is a cold core in corner of my mouth then a big really dark blister appeared in middle of lips and my lip swollen?

A doctor has provided 1 answer

Secondary infection: Secondary infection of a cold sore from HSV can be the cause. See your doctor for treatment. You may need an antiviral medication and an antibiotic.

Answered 11/17/2014

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