Doctor, I'm 38 yrs and noticed the small 'ball bearing' lump in my left armpit (since >10 yrs ago) has grown bigger (around 0.8cm) and irregular in shape (to the touch and visible). When I press it, I feel a numbing sensation down the left arm. My left nipple retracted after my 2nd child was born (she's 9 yrs now). The left breast feels heavier and lumpier than the right side, too, and is a little painful when pressed. I do monthly breast examination but cannot feel lumps in that breast. Please advise if the armpit lump and other breast symptoms listed above are synonymous with breast cancer. I dare not go to the doctor as I do not have any health insurance and am afraid that insurance companies will not cover me upon knowing I may have cancer. Can a small ball bearing like lump become cancer? If so, what stage am I likely to be at?