A member asked:

My 4 months baby got a lump when he had a vaccine. we give him medicine and massage but dr. said that a bit will stay and it is harmless.is it so?help

A doctor has provided 1 answer

Transient reaction: These vaccines are injected into muscle tissue that can react with a transient hardening.The knot created can last for days or weeks but is harmless in the long run.

Answered 10/7/2015

2.2k views

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