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A 20-year-old member asked:

My daughte got her mmr today and broke iout in hives. is this a common reaction? if so how bad is it? should i be concerned? should i halt future vax

2 doctor answers8 doctors weighed in
Dr. Edward Neilsen
Family Medicine 19 years experience
Don't stop vaccines: About 5% of chldren develop a rash after their first mmr. This doesn't necessarily indicate an allergy, and benefits of getting vaccinated usually outweigh the risk except with severe allergic responses (breathing problems, etc). Typically these go away in a few days but if your child shows any more worrisome signs (wheezing, fever), let your dr know immediately.
Dr. Steven Machtinger
Allergy and Immunology 44 years experience
1st or 2nd MMR?: Hives after MMR booster occurs rarely and have been reported to be due to traces of gelatin in the vaccine. Mmr vaccine is grown on gelatin. Hives in children with egg allergy receiving MMR vaccine is exceedingly rare. In either case bring this reaction to the attention of your pediatrician. An antihistamine may be prescribed. A referral to any allergist for evaluation may also be helpful.
Dr. Joseph Hermann
Family Medicine 43 years experience
Are you sure it was hives she experienced? It is normal in some people to experience a rash after an MMR, a common and benign side effect of the vaccine. I would not be overly concerned about her receiving future vaccines; the benefits almost always outweigh the risks.
Dec 23, 2011

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