I have something like this at the moment, although mine is hard and small like a marble. I'm also breastfeeding my 4.5 year old. I can also feel mine when I cup my breast and lift up. 

Where abouts is yours?

I'm waiting for a gp appointment as I don't think mine is normal. There is nothing like this in my other breast (I've checked alot) I'm 35 and scared to death 

Oh I'm sorry you're so worried - I hope that you get some answers and reassurance asap. If I lie on my back it feels as though it's under my breast and stuck down, i can sort of put my fingers over it but it doesn't move and is really hard. Im driving myself mad flitting between thinking it's nothing and then worrying. My mum had breast cancer a couple of years ago so I don't know if I'm being neurotic

Oh I'm sorry you're so worried - I hope that you get some answers and reassurance asap. If I lie on my back it feels as though it's under my breast and stuck down, i can sort of put my fingers over it but it doesn't move and is really hard. Im driving myself mad flitting between thinking it's nothing and then worrying. My mum had breast cancer a couple of years ago so I don't know if I'm being neurotic

Just for peace of mind I would get it checked.  It took me days to make the appointment but I'm glad I have  although I'm now scared to death waiting! 

I've had many blocked ducts over the years and this doesn't feel like a blocked duct for me. There's no bruised feeling or pain which I normally have had.