I'm a bit concerned about my daughter who's 3.5 months old. She recently got the pentavac vaccination and I've noticed some swelling and a lump forming at the injection site. Is this something I should be worried about? Is it a common reaction?

Answered by 1 Apollo Doctors

Dr Ranjith Darla

General Practitioner

MBBS
3+ Yrs

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After pentavac vaccination, it is common for infants to experience swelling and lump formation at the injection site. This is a normal reaction to the vaccine. You can give her a dose of acetaminophen (e.g. Tylenol) as per the recommended dosage for her age to help with any discomfort. If the swelling or lump persists or worsens, please consult with your pediatrician.

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Answered 04/07/2025

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Disclaimer: Answers on Apollo 247 are not intended to replace your doctor advice. Always seek help of a professional doctor in case of an medical emergency or ailment.