Wiktionary
canker sores
n. (canker sore English)
Usage examples of "canker sores".
He was suffering from canker sores in his mouth although he wore knot charms against them.
She got canker sores in wintertime (against which Zizmo had taken vitamin C).
Questor sent a flurry of canker sores into the dragon's mouth, but the hide was so tough they couldn't even begin to settle before they were dispatched.