I put "post" in inverted commas as I am stroll breastfeeding but I haven't breastfed from the breast with a lump for over a year. I previously had a lump in the same breast which I had removed and I think the surgery to removed it affected the milk ducts as I could never produce as much from that side (I exclusively expressed for a while and the difference was notable). I am now a year on and have quite a solid lump marginally below and under my nipple. I know I need to get it checked. But I suppose I'm looking for an alternative, logical solution - is it possible that it's milk that had built up? If I squeeze my nipple I can still get milk from there but obviously not much. If I squeeze the lump itself then no milk appears. The lump is hard and painful if pressed.