I am 35 years old. I have a rather large lump (golfball-sized and somewhat soft) in my armpit that appeared two weeks ago. I believe it to be a lymph node because this area has been swelling up and going back down for about a year, but never getting this big. When the lump swells up it is tender to the touch, but not independently painful. I don't have any other symptoms that I associate with this lump. My doctor has started me on an antibiotic because she is convinced it is cat scratch disease - I am not convinced. I had mammogram (my first), chest xray and an ultrasound. While my doctor said they were OK, the radiology clinic sent me a letter saying the ultrasound showed a suspicious area that should be re-checked in 3 months. During the ultrasound, the technician focused on a spot in the lower area of my left breast - the same side with the lump in the armpit. Are these related? The information on the internet about lymphoma scares me because I get night sweats too. At my next appointment I intend to insist that my doctor arrange to have fluid drawn from this lump and tested. Any input?