Hi. Thank you in advance for you help. I have a 6 month old baby and have been breastfeeding for the entire time. I went back to work 2 months ago and she has taken some bottles a day. However, this past week I have been home and able feed her more than I had in the few months since I went back to work. Today I was taking a shower and noticed a very round, movable, lump in my breast by the nipple. I am worried and do not know what to do my MD is not open this week do to the holdiay. I just was in to the OB for my yearly and in October and there were no lumps in my breast. This is a big lump the size of a large pea. Could this be beause I am producing more milk? Or is it something more.