canker sore

Noun

An ulcer in the mouth, called an aphthous ulcer, caused by a break in the mucous membrane.

Japanese Meaning

口内炎（アフタ性潰瘍） – 口腔内の粘膜が破損することにより発生する潰瘍

I couldn't enjoy the spicy soup because a canker sore on my inner lip made every bite painful.

口の内側の唇にできた口内炎（アフタ性潰瘍）のせいで、辛いスープを楽しめず、一口ごとに痛みを感じた。

Sense（1）

An ulcer in the mouth, called an aphthous ulcer, caused by a break in the mucous membrane.

canker sores

（ plural ）