'Lesion' is a good word to know. If you first encounter it in reference to a cut or boil or pimple, you might think it refers to breaks in the skin. That's certainly what I used to think.
Then I'd hear doctors and
nurses use it when speaking of things happening inside the body. So I
knew I was a little off there.
Finally got around to looking it up recently. Whatdaya know! A lesion is pretty much any abnormality in living