1.Tea tree oil
Tea tree oil has antiviral, antiseptic, and anti-inflammatory properties. These all come in handy when you need to treat a cold sore. A review on tea tree oil’s uses for skin disorders found that it has a potent antiviral effect on HSV.
You can apply diluted tea tree oil directly to your cold sore using a clean cotton swab, but make sure you dilute it with a gentler “carrier” oil (such as coconut oil or jojoba oil) so you don’t hurt your skin. Don’t use tea tree oil more than twice per day, or your skin may become irritated.
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2. Peppermint oil
Peppermint oil is another essential oil with the ability to kill a virus that’s been activated.
A lab study on HSV demonstrated that peppermint oil could calm the symptoms of an activated herpes strain — even strains that are resistant to other kinds of drugs.
Apply diluted peppermint oil directly to the cold sore at the first sign of it for best results.