Canker sores are usually found on the movable parts of the mouth, such as the tongue or the inside lining of the lips and cheeks, and at the base of the gums. The ulcers begin as small oval or round reddish swellings that usually burst within a day. The ruptured sores are covered by a thin white or yellow membrane and edged by a red halo. Generally, the sores heal within two weeks without scarring. Fever is rare, and the sores are rarely associated with other diseases. Usually, a person has only one or a few canker sores at a time.

Most people experience their first bout with canker sores between the ages of 10 and 20. Children as young as 2 years old, however, can develop the condition. The frequency of canker sore recurrences varies considerably. Some people have only one or two episodes a year, while others may have a continuous series of canker sores.

Canker sores hurt, especially if you eat something hard, crunchy, salty, or acidic (like orange juice). They usually go away on their own and they are not contagious. So no one can catch a canker sore by kissing you or sharing your drink.

Most canker sores don’t hurt as much after the first few days, but it may take 2 weeks for the sore to heal. While you’re waiting, you’ll want to be careful when eating and brushing your teeth. Scraping the sore can make it hurt worse. You might need some medication to dull the pain. Your mom or dad can ask your doctor about which one is best for you.

If your canker sore is large, lasts longer than a week, or is keeping you from eating, you should see your doctor so he or she can check it out.

There’s no guaranteed way to prevent canker sores, but it’s a good idea to eat healthy, get enough sleep, and try not to get too worried or upset. Put canker sores on the list of things you don’t have to worry about. They hurt for a little while, but before you know it, you’ll be a sore loser!