Hmmm,...: From your description, it certainly may be a cold sore, but diagnosing medical issues, especially rashes , over the computer is impossible. If it persists, and you are concerned, have him see a Dr. for the official diagnosis, best wishes.
Answered 10/27/2020
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Sounds like: the very early beginning of a herpes labialis outbreak. These are contagious viral blisters.
Answered 10/26/2017
500 views
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