Lumps developed inside the breast

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5
I have been a Type 1 diabetics for 37 years. Within these 5 years, hard lumps have been developed inside my breast and it seems that are growing bit by bit when I did my annual body checks up. Once, I have an operation to have these lumps removed, but after a year or so they formed again. I went through an examination and luckily they aren't anything related to breast cancer cells. Anyone can inform what exactly they are and what need to be done?

Secondly, just want to consult - what is the symptoms on Kidney failure?

Pls kindly advise, very much appreciated.

Annie