I am currently pumping and bottle feeding. Yesterday while pumping and messaging my breasts to get more milk I noticed a lump. I don't know if it is a plugged duct or what. It is still there after pumping. It doesn't hurt and I've just started the massaging technique so I don't know how long it's been there. It is at the base of my breast where the breast meets the chest. I don't know if this is common and it will go away or should I worry? I am freaking out a little since my mom was diagnosed with breast cancer a year ago. Thank God she is cancer-free now but because they caught it early. Do lumps occur often while breast feeding? How long do they stay? Has anyone else had this occur?