Ever since my milk came in after DD was born, I've had a smallish lump in the outside half of my right breast, about the size of a small grape. It didn't really hurt, but sometimes when she's nursing I got a vague refered pain under my collar bone or my shoulder blade. Today when I was getting in the shower I noticed my breast was red over the area that had the lump. It did seem to change size a bit before and after some feedings. I don't have a fever or significant pain. As I was typing a post about this lump I was massaging and pressing it, and it popped! I immediately hand expressed some milk and everything seems fine, but what the heck? It aches a little, but the lump is totally gone. Has this ever happened to anyone else? I've had this lump almost 6 months. I was thinking it could be a partially blocked duct. Now I'm wondering if it was some sort of cyst. I'm truly puzzled!