I agree that it must be a blocked duct. I've had this many times, mostly when dc were going through a growth spurt where they would feed alot for a week, then go back to normal BFing.
When they get very backed-up they create huge nodular bumps that are tender, which can turn into mastitis after a while.
I would jump in a hot shower and massage the breast then get dc to nurse. You can also try wool breast pads. I find them very useful since they keep the area warm and help the duct become unplugged. Continue pumping too, with the warm compresses, it will eventually unblock itself with all that you are doing.
When they get very backed-up they create huge nodular bumps that are tender, which can turn into mastitis after a while.
I would jump in a hot shower and massage the breast then get dc to nurse. You can also try wool breast pads. I find them very useful since they keep the area warm and help the duct become unplugged. Continue pumping too, with the warm compresses, it will eventually unblock itself with all that you are doing.