What are canker sores?
Canker sores are shallow, painful sores in your mouth. They are usually red or may sometimes have a white coating over them. You might get them on the inside of your lips, the insides of your cheeks or under your tongue. Canker sores are different from fever blisters, which usually are on the outside of your lips or the corners of your mouth.
Anyone can get canker sores, but people in their teens and 20s get them more often. Canker sores may run in families, but they aren't contagious. Doctors don't know what causes canker sores, but stress may be a factor.
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What should I do when I get canker sores?
If you have small canker sores you can treat them at home. You can try taking ibuprofen (brand name: Advil) or acetaminophen (brand name: Tylenol) for pain. Other medicines, such as Anbesol, Oragel, Orabase and Zilactin-B, might keep your canker sores from becoming irritated by eating, drinking or brushing your teeth. You put these medicines right on the sore.
You can also mix equal amounts of Milk of Magnesia and Benadryl Allergy liquid. After it's mixed, you can swish a teaspoonful in your mouth for about 1 minute and then spit it out. If you do this every 4 to 6 hours, your canker sores may hurt less.
Some people think that sucking on zinc lozenges, taking vitamin C or vitamin B complex, using a sage-and-chamomile mouthwash or taking a lysine supplement helps their canker cores heal faster.
I've had this one for nearly a week and it won't go away 
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