What is the reason for redness and swelling around the injection site after getting vaccinated?

Patient's question:

Baby will be 5 days and 11 months old in 5 days. Yesterday morning, I took him to get vaccinated. Tonight, after taking off his clothes, I noticed redness and swelling around the injection site.
What help is needed: Is this serious? How should I provide supportive treatment? Thank you!

Doctor's answer:

I don't know which vaccine you received. Many local redness and swelling are normal reactions to the vaccine, although it's not ruled out that it could be contagious. If it's the former, no treatment is needed—just avoid contact with water and keep the area dry. If it's contagious, you should use anti-inflammatory medication. Don't worry, and I hope your child stays healthy.
The above advice is for the question "What should I do if there's redness and swelling around the injection site after vaccination?" I hope it helps you. Wishing you good health!

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