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A 27-year-old member asked:

I 36+hrs since my 6mo had her reg schld. vaccines & there is still an extremely hard knot, bruise, redness, warm/ painful to touch at injection site. ?

1 doctor answer3 doctors weighed in
Dr. Alfredo Garcia
Pediatrics 56 years experience
Vaccine side effects: Local reactions from vaccines can last for from 24 to about 72 hours. A hard "knot" can last days and even weeks but usually disappears in due time. I suspect your infant received the dtap vaccine as this is a common occurrence with it. No nee to worry.

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Last updated Jul 5, 2014

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