I have a fatty necrosis on my breast. Should I be concerned? Breast implants 4 years ago.

I’ve had implants now for 4 years, after a recent ultrasound and mammogram that I had just as a check up, a fatty necrosis has been found . I’m going to see my surgeon in a couple of weeks to discuss this. Is this something I should be worried about, will I have to have my implant removed? I’m also wondering if I could of had this for years and not known. I cannot feel the lump.