My boyfriend got a flu shot and a pneumonia shot on Wednesday in the same arm. He is now appearing to be having a reaction. His arm at the injection site is swollen and is radiating heat. He is also on a new medication Invokana. Could he arm be infected?
Hello, I have studied your case. Most probably your boyfriend is having pain due to hematoma in shoulder muscles. It can be infected also. He should see his doctor. He might need a course of antibiotics.  Also, he should apply ice and avoid this arm to use too much. Rest will allow this hematoma to heal fast. I hope this answer will be useful for you. Let me know if there is any other followup questions. Thanks