Could be either one: What you describe could come from contact with a substance, like lip product, that you came in contact with. You may be allergic to one of the components. It is also possible that you had an allergic reaction to something you ate. Try to look back over the time just before you got the rash and figure out what it might have been. It does not sound like herpes if burning went away quickly.
Answered 3/9/2017
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