My LO is five months and i've been exclusively pumping for three. This morning I woke up and my left breast is so tender, especially around the armpit area toward the aerola but not on the aerola. (excuse my spelling) I thought I felt some lumps so I started to pump even longer. Now, it feels like a tender mass.
It's Saturday so my doctor is not available.
What can I do? Does this sound like a plug duct or something worse?