The same happened to me! I got mine Oct 2012 and I feel terrible and have a really bad rash...I never get the flu so I never get the shot but I was required for a clinical and now I have bronchitis with bloody sputum, headache, and this terrible rash!!
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You have lymph nodes in your armpits. The lymphatic system controls the fluid in the body and when you get an infection or a foreign entity that it does not like the fluid will build up in that area to get rid of it. This then passes through you lymph node causing it to swell and get sensitive this is fine and should pass in a day or so.