I had this happen yesterday and it was such a hassle. My baby is 8+ months old. Never happened before that. All I can say is pump, nurse, pump, nurse, heat pad (preferably damp) hot shower, massage to move clogged stuff (lump) towards the nipple, and patience, because it sucks! It took me all morning into the evening to get rid of mine, but I finally did! I think it was gone by 7 pm ish. I discovered it in the early am, I think it developed during the night.