I woke up this morning to a painful left breast and noticed 2 small lumps. I have been nursing excusively on that breast today, using heating pads, pumping both sides, massaging, resting. I took a long bath and massaged followed by a hot shower, more massaging and then I pumped (my 5 week old son had just been fed a bottle of breast milk). After pumping I noticed that my left nipple was enlarged. The lumps are still there. I am not in as much pain but feeding/pumping is painful. What does the enlargement mean?