break out in a rash
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To experience visible skin irritation. After my husband broke out in a rash, we realized that the bushes he'd been trimming in the back yard were actually poison ivy. I had to go to the emergency room because the medication I'd been prescribed caused me to break out in a rash and have trouble breathing.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
break out in a rash
[for the skin] to erupt with a rash. (See also break out in a cold sweat; break out (with a rash).) I knew Dan had the chicken pox, because he broke out in a rash and had a dry cough. The baby breaks out in a rash all the time.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.