Hi,
It is good that you'll be checking in with your doctor. Sometimes, if there is a bump in the breast, there is also an inflammed lymph node present. However, with your history of previous cyst in the axilla, a recuring one could also be a possibility. At this point, a clinical breast examination and possible mammography, could be helpful in the diagnosis. Take care and keep us posted.
I have had a bump in my armpit for over a year, it is very hard and now I am starting to feel another one coming under the same armpit. I had one several years ago which became infected and had to be lanced. I also have discovered a lump in my left breast, have a dr appt this week, i wonder are they connected