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Cold sores - common term, and have many etiologies. The one of most interest though is probably herpetic cold sores. Unfortunately, this viral caused outbreak plagues many. As much as 65% of people are probably sero-positive for the virus, but luckily most don't ever manifest the symptoms. Unfortunately, no one quite knows what triggers outbreaks. However, stress is probably one of the more common associations. As you may have noticed from commercials, there's no treatment for herpes, but you can certainly take medications to suppress outbreaks. I would suggest paying a visit to your physician, asking for a tsank smear of the ulcers. If positive, consider starting on acyclovir, or valacylovir for treatment and prophylaxis.
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liz
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