Granny's gone and done it again

Here's your AI response, Granny:

A firm knot or lump in your arm after a flu shot is usually a normal immune response, caused by a buildup of immune cells and fluid at the injection site. This is a sign the vaccine is working to build protection. The knot should typically go away within a couple of days to a week, but you can apply a warm compress or gently move the arm to help alleviate it. However, you should contact a doctor if the lump worsens, you experience severe pain, or you have other signs of a more serious reaction like fever, pus, or difficulty breathing.
 

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