Hi, may I answer your health queries right. My name is kaylene 50 years of age,had a flu shot on Tuesday and have a extremely sore upper arm. Sooo painful I went to the doctors yesterday. They gave me steriods and pain relief but it doesnt seem to be letting up.
Thanks for your question on Chat Doctor. I can understand your concern. You might have developed injection abscess. Flu vaccine is given intramuscular (into the muscle). In normal circumstances, mild pain is likely after flu shot. But when vaccine was not given properly, it can damage muscles, nerves and blood vessels. And this can cause local site abscess formation. This abscess gives a lot of pain. So possibility of infection site abscess formation is more in your case. Get done ultrasound examination of local site, if there is abscess then you need incision and Chat Doctor.  You may also need antibiotic and anti-inflammatory