A 33-year-old member asked:
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What causes fever blisters/ cold sores on my upper lip?!?

1 doctor answer
Dr. Jana Tomsky Corvalan
26 years experience in Family Medicine
Herpes simplex virus: It is very common virus everybody is expossed once upon the time in life. Outbreak may happen for variety of reasons ( fever, exhaustion, period in woman, etc... Most efective treatemnt is oral anitviral medication ( it is a prescription)
Answered on Apr 17, 2019
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