like PP said, no lump should EVER be ignored. BUT it is very, very, very common, just massage it while in the shower, and prior to/while nursing. it SHOULD go away, also, if your have an improperly fitted bra, it will compress ducts (they extend almost into your armpits- kinda cool! I never knew that until I got fitted for a new bra) and can cause lumps to occur. Get yourself fitted (wait a couple more weeks for your supply to drop- that's normal, right about now you're still making enough to feel 2 babies, not just the one) for a new bra- PROPERLY fitted by a professional, and this should not be such a problem.
If after a week it has not gone away, or worsens, have it looked at. you could have mastitis (which is an infected duct), or just one thats a little clogged- try to massage it out.
at 1:27 PM on Jan. 25, 2010