Mayo Clinic Q and A: Cold sore virus can 'wake up' after remaining dormant for years

DEAR MAYO CLINIC:?I have had a few cold sore flare-ups over the past few months after years without getting any. What causes them to come back, and what's the best way to treat them? ANSWER:?Cold sores?are caused by the herpes simplex virus. Once you're exposed to the virus, which is typically passed from skin-to-skin contact, [...]
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