A canker sore or aphthous ulcer is an open and painful mouth ulcer or sore.
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Unlike cold sores canker sores don t occur on the surface of your lips and they aren t contagious.
Canker sores are small shallow ulcers that occur in the lining of the mouth.
The medical term for canker sores is aphthous ulcers canker sores start as white to yellowish ulcers that are surrounded by redness.
Canker sore canker sores also called aphthous ulcers are small shallow lesions that develop on the soft tissues in your mouth or at the base of your gums.
It s also the most common type of mouth ulcer.
They re usually very small less than 1 mm but may enlarge to to 1 inch in diameter.
Place the canker cover patch on a clean dry finger with the white side up.
If sore is difficult to reach in the fold between the cheek and gum or near the teeth or lip break the patch along the score and use half.
Place the white side on the sore and hold in place for 2 seconds.
Stress or tissue injury is thought to be the cause of simple canker sores.
Some people notice them inside their lips or cheeks.