Patient & Family Education Materials

Start over with a New Search

Word! Canker Sore

Canker Sore

Say: KAN-kur soar

This is a small mouth sore that's a big pain. Canker sores are open sores that have a white or yellowish coating and are usually about ΒΌ of an inch across. You might find them on the inside of your lips and cheeks, at the base of your gums, and on or under your tongue.

Back To Top

Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.

© 1995-2017 KidsHealth ® All rights reserved. Images provided by iStock, Getty Images, Corbis, Veer, Science Photo Library, Science Source Images, Shutterstock, and Clipart.com