reading on TB, seeing the word "wheal"

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I like medicine, and I was reading on tuberculosis. They were talking about the skin test, where they observe for and measure the size of a small red "wheal." It's not a word I see often. I thought how someone might have an injury which causes a wheal. Then I remembered this group called "We Hate Eastern Air Lines" which of course spells out wheal. This is a story I read in a book on commercial aviation, and there was no picture of any type pertaining to this, just the story.

And that's how I understand much of life, through story and narrative.