There is no one cure for a canker sore. Most people take ibuprofen for the pain and rinse the mouth with anti-bacterial mouth wash to help reduce the size. You can find more information here: wisegeek.com/how-can-i-treat-canker-sore....
Cold sores look worse than they tend to be and are easily treated with over the counter medication cream. Make sure you don't drink after others who have them, to avoid getting them.
To temporarily hide a cold sore, apply a layer of liquid bandage to cover the entire sore and allow to dry completely. Apply another layer and allow to dry again. What this does is cover the sore and provide a smooth surface for the application of lip color or lipstick, and also protects the sore from further infection.
When completely dry, use a lip brush (this can be sterilized by soaking in boiling water and bleach) and apply a dark enough shade of lipstick that will cover the cold sore, and sterilize the brush again after use. Just ensure the cold sore is completely covered with the liquid bandage before applying lip-color because if not, the lip-color/lipstick could irritate/worsen the sore. Make sure to use a dark enough shade of lipstick to hide the sore.
To remove, wash off carefully and make sure to dry the cold sore as much as possible with alcohol. Do not use this or any method that "seals" the cold sore too often, as it will interfere with the healing and drying process. Hormonal changes can sometimes prompt an outbreak.
Don't be surprised if certain forms of birth control (such as the morning after pill) cause an outbreak. If the sore erupts on your lips, apply lib balm several times a day. If applied from the start of the outbreak this can stop the blister from forming into a scab and therefore reduce the length of the outbreak.
Be careful––if you press too hard on the sore you can break it and cause it to scab. To prevent the virus from spreading, it's important that you use your fingertip or a cotton swab to apply the lip balm, and don't let your finger or the cotton swab touch the lip balm after it touched your sore. Wash your hands immediately after applying the lip balm.
Some find that the prescription medicine Valtrex is the best way to get rid of a cold sore; see a doctor if you would like to pursue this treatment direction. Some people apply gel antiperspirant or cologne to the cold sore at night to dry it out. The antiperspirant/alcohol component may help dry out the sore.
A mud-mask product is excellent for an oozing cold sore. Apply it to the sore at night to help dry it up. If the sore is on your lips, you can hide the mud during the day by using a lip liner brush (which you discard or disinfect after the outbreak) and mixing a bit of lipstick with the mud.
It will cover your sore and keep it from oozing during the day, often one of the most unpleasant aspects of having a cold sore.
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