Possibly: Herpes simplex virus lives in the nerves after you are infected with chicken pox. It can resurface almost anywhere, but the lip would be an uncommon area. Other potential causes would be a cold sore, which is a different type of viral infection.
Answered 9/11/2013
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A doctor has provided 1 answer
A doctor has provided 1 answer
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A doctor has provided 1 answer
3 doctors weighed in across 2 answers
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