From Longman Dictionary of Contemporary Englishcome out in something phrasal verbcome out in spots/a rash etcILL if you come out in spots etc, spots appear on your body If I eat eggs, I come out in a rash. → come→ See Verb table
Examples from the Corpus
come out in • On Thursday night Chris came out in dark red blotches.come out in spots/a rash etc• Tell them you've come out in a rash, or something. 