Galactocele's are generally treated by aspiration and if this one recurs, then you should see your physician. I am not sure if I am in right room, my son is almost 2. I never breastfed him, but I continued to leak until he was 8 mo. You should see your physician. That could be something serious.
Galactoceles are single or multiple nodules that contain milk.
Anything that obstructs the duct of the breast during lactation may cause a galactocele. Most often, galactoceles occur at the end of breast-feeding when the milk is allowed to stagnate in the breast. Sometimes the mass isn't found until months later. There really aren't any preventive measures, and galactoceles are simply dealt with by aspirating the milk with a needle. Unfortunately, my OBs had trouble diagnosing the galactocele and it achieved about 8 centimeters in diameter.