lesion

LEE-zhun

meaning in plain English

A mark or sore on your skin or inside your body that’s not normal, like a cut, bruise, or spot that shouldn’t be there.

for example

After the fall, she had a red lesion on her knee that took a week to heal.

Imagine you scrape your elbow and it doesn’t go away—it stays red and tender. That’s a lesion. It’s your body’s way of saying something’s wrong, like a warning sign you can’t ignore.