Hi, I have been exclusively BF for just over 12 weeks , tonight my right boob feels tender, it was a bit "ouch" when she fed from it before I put her to bed and I have just had an investigate (lol!) and there is a hard lump on the top of it, is this a blocked duct or something? Should I be worried about it developing into something more serious? Any tips for releiving the tenderness? Sorry for all the questions, I would be grateful for any thoughts, TIA!