I've had this lump next to my nipple for what feels like forever, and I'm not really sure how long it's been there. It's kinda weird because the lump seems to get taller when my nipple gets hard, and when it's soft, the lump flattens out. It's not painful, doesn't move around, and it's pretty soft. I'm a bit worried. Why is this happening? Is it something I should be concerned about?
do one ultrasonography