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I had a flu shot 2 months ago and my arm started to bother me days later and just kept getting worse. I have a lump, which they thought was a lipoma, after the ultrasound they told me it was residual swelling from the flu shot. This pain in my arm has really affected my everyday life. I have excruciating pain at times, can't sleep, open or shut car door with that arm, put on seat belt, get dressed etc, without pain. The first doctor I went to did put me on Keflex. Today I started physical therapy and they did ultrasound on my arm. They told me I did have an infection and the Keflex had cleared it up, but it left the muscle injured with scar tissue. Hope that was how they worded it. So now I am praying this will take the pain away. It has been so frustrating because the pain was draining me and I just couldn't get any answers. I called the health unit where I got the shot, and they told me they had never heard of residual swelling from the flu shot. It is probably a good idea to let them know if you are having pain so they can help others going through this. If the ultrasound works, I will be calling them so they can help others sooner.