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A fancy way of saying things are about to get ugly. Like really ugly. Think boils, blisters, and a level of pain that makes you wish you were dead.
My mom said my brother's rash was a bad rash. I said I'd rather be in a burning building.
The teacher said the classroom was a bad rash. I believe her. I can smell it from the hallway.
My dog got a bad rash from eating my sister's old socks. He now looks like a fried potato.