I woke up last week with a very painful, golf ball sized lump in my armpit. I went straight to the doctor and he said it isnt a lymph node, and he cut into it to test for staph. the staph test came back negative and he packed it full of gauze for 2 days. When i went back to have the guaze removed, it was still huge and painful, so he sent me to the hospital for an ultrasound. The ultrasoiund showed that it isnt a cyst and it isnt an absess, so the dr ordered a ct scan which i will get the results of today. What could this be? It started red on the surface, although the lump seemed deep under the skin.