I've just been to the doctor because I have had a lump in my breast for some weeks now. I assumed that it was a plugged duct, and that it would go away. However, it did not and after much massaging, hot showers, hot compresses and and trying to nurse my almost weaned two-year-old as much as possible, the lump persisted and now it's sore. The glands behind my right ear and the back of my neck are swollen, but my temp pretty much normal. The doctor said that we should treat it with an antibiotic, and she gave me amoxicillin. Does this sound right? When does a plugged duct become mastitis? And can a plugged duct last for so long? Thank you!!