Is this breast tissue?

I have a lump on the rib just below my collar bone & I was wondering if breast tissue goes that far up?  The lump is quite large & feels like it’s attached to the rib. I’m 48 & I’ve had many breast lumps over the years, which were either fibroadenomas, lipomas or enlarged lymph nodes. This lump feels completely different to all the others. It’s immovable, hard & painless. I got an appointment with my gp but it’s not until the end of the month.

Hi Emma,
It might be an idea to post on the ‘ask our nurses’ board of the forum.
It’s good you’re getting it checked out.