Hello,

I'm 23 and a couple of days ago discovered a pea sized, oval lump between my right breast and my armpit. It's oval and smooth so I wasn't too worried as I figured it was a cyst or fibroadenoma. I have a few days before my GP appointment but I'm the kind of person to overthink everything so I did some research and found something slightly worrying. Unlike a cyst, this is a very hard lump and it won't move at all - I can feel where is it attached to tissue underneath. I am very flat chested so it's easy to feel everything going on, and also because of this I think it might be interfering with my muscle there as my armpit aches constantly. Has anyone had a fibroadenoma that was immobile before? Everything I can find on hard immobile lumps points to the worst and I can't stop thinking about it!