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A 45-year-old male asked:

My son had a flu shot on saturday at clicks. today the spot is red and hard. his arm is very sore. is this normal, if not, what should i do?

1 doctor answer2 doctors weighed in
Dr. Clarene Cress
Specializes in Pediatrics
Some local rxn ok: It is not uncommon to have some redness at the site of injection for many vaccines, but, in general, this is not very common with the flu vaccine unless there is a mild allergy to one of the ingredients. If the area of redness is about 1 inch in diameter or less, try cold compresses for a day and oral Motorin. If larger than 1 inch now or getting larger, seek medical care for possible infection.

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Last updated Apr 2, 2019

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