It may be a lymph node reacting to the surgery. I've had lymph nodes that are palpable under my arm after having surgery since last summer. It should go away (eventually), but if it gets bigger, begins oozing, or you notice enlarged lymph nodes in your neck, collarbone, groin, or other armpit, contact your doctor as soon as you can, as you may have an infection or another condition.
I had a breast reduction 2 weeks ago and 2 days ago i found a lump under my left armpit..i'm assuming it is a cyst but I'm not sure. It feels like a marble, looks red and slightly hurts. I'm hoping it will go away in a few days instead of assuming the worst (like a blood clot). Does anyone have any advice?
You should go and see your doctor on this. Do NOT ever stick a needle in a lump yourself!!! That's what doctors are for. I had a lump in my arm pit last year, it wouldn't go away so I went to the doctor, had an ultrasound (u/s showed complex cyst) and had it removed. Turns out it really was a complex cyst, and nothing to worry about. I have other lumps under my arm pits that the doctors have always told me not to worry about unless they hurt or change size/shape.
Good luck and see a doctor!!!