My husband got a flu shot two years ago as he has COPD and had pneumonia twice. Over the last year a small hard bump started to form. He showed his doctor who brushed it off. A couple of weeks ago his shoulder started aching. Arthritis? I applied Ben Gay copiously. Then a pimple started to form where the bump was. I went at it. I can't tell you the crazy amount of stuff that came out of it. All at the injection site. God only knows what was in that shot. BTW he's not vaxxed. Rabidly anti.