Inflammation: The redness is usually just inflammation caused by the cold sore virus. Rarely it is a secondary bacterial infection.
Answered 9/28/2016
5.4k views
See below: Inflammation. Which can be simply due to the cold sore or other issues like a secondary bacterial infection. However, if just started, it is likely just part of the inflammatory process with the cold sore.
Answered 9/28/2016
5.4k views
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