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Birth Control: Once You've Started
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Cold Sore Treatment
What can trigger a cold sore?
Last updated on September 30, 2020
A cold sore can be triggered by many different factors, including
Hormonal changes during menstruation or pregnancy
Extreme temperatures (hot or cold)
Stress (physical or emotional)
Fever and illness, such as cold or flu
Damaged, dry or cracked lips
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