If you have a hard lump after the breast pump, consider the local soft tissue swelling or stagnant milk is not discharged. The milk stagnation caused by the pressure and blockage of the milk ducts during breastfeeding leads to edema of the tissues around the milk ducts, which is very easy to form an infection once there is a bacterial invasion. When the breast pump is finished, if the stagnant milk can be discharged, the lumps will disappear very soon, and you can apply a local hot compress first, which will help the disappearance of the localized swelling. If the use of breast pumps, the accumulation of milk is not discharged, lumps hard lumps will continue to exist, you need to go to the hospital in a timely manner, so that the doctor massage lactation treatment, if necessary, the need for needle suction puncture pumping out the milk, to avoid a long time to avoid the accumulation of bacterial infection, the formation of suppurative mastitis. If there is a localized infection, you need to take oral antibiotic medication in a timely manner, and try to go to the hospital, so that the doctor can check and diagnose.