Dùng ô-xy già. Dùng dầu khoáng petroleum jelly hoặc mật ong. Đắp đá viên lên vết mụn rộp. Thử dùng cúc tím echinacea. Dùng bạc hà chanh. Thử bôi tinh dầu hoặc chiết xuất thiên nhiên. Bôi thuốc mỡ có thành phần cây đại hoàng và cây xô thơm. Làm thuốc mỡ cam thảo. Dùng sản phẩm sữa lạnh. Bôi gel lô hội.

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Hydrogen peroxide has antiseptic and antiviral properties that can help reduce inflammation and fight the viral infection causing the cold sore.  Soak a cotton ball or cotton swab in 1 teaspoon (4.9 mL) of hydrogen peroxide and hold it directly over the cold sore for 5 minutes. Rinse your face gently with cold water afterwards, and throw away the used cotton ball. Make sure not to ingest the hydrogen peroxide as you apply it. Protect your cold sore by covering it with medicated petroleum jelly, such as Vaseline, after it has drained. This will help keep the sore moist and prevent your skin from cracking, essentially providing a protective seal over the sore as it heals.  Do not use your fingers to apply the jelly, as you can spread the virus to your fingertips. Instead use a cotton ball or swab to apply the jelly as needed until the sore heals. If you do not have any petroleum jelly on hand, you could use a little honey. Honey has antiviral and antibacterial properties that can protect the cold sore against additional threats while also fighting the underlying virus. Apply a little honey using a cotton swab and cover the site of the cold sore completely. Hold an ice cube or ice pack directly on the cold sore for a few minutes to reduce inflammation and numb pain. If you're using an ice cube, consider wrapping it in a towel for your own comfort. Press the icy surface to the cold sore until the cold has numbed the pain and remove it shortly after. Do not leave the ice on for extended periods of time. Repeat this procedure once every 1 to 3 hours. Note that you should only do this when the cold sore is new. If the cold sore has already broken open, ice could actually hinder the healing process by slowing down blood flow (with its corresponding healing properties) to the lesion. Echinacea tea is believed to strengthen the immune system, thereby assisting your body's natural immune response as it fights the cold sore. Steep 1 bag of Echinacea tea in 1 cup (240 mL) of freshly boiled water for 10 minutes. Drink the...