A member asked:

Daughter had 3 vaccine friday she has a red swollen hard warm spot at least 4in by 4in and has gotten bigger should i take her in?

A doctor has provided 1 answer

In general, yes: A 4-inch round vaccine reaction is big enough to go back in to have the doctor evaluate to see if any treatment is needed. Doctors also want to keep track of which patients get big reactions with which vaccines, although having a localized injection-area reaction after one dose doesn't always lead to the same reaction after the next dose. The doctor can judge and decide.

Answered 8/27/2017

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A member asked:

What can cause a itchy red warm swollen spot on my arm?

A doctor has provided 1 answer