Fat necrosis feel like/ how long does it take to develop?

Although I am stage four I have had fat grafting as well, and experienced a large acorn sized lump that was also rock hard. There is absolutely every reason to think it could be fat necrosis. Mine also appeared overnight literally. It can happen years and or months from surgery. It all depends on how fast the cells die and group. If there isn’t enough blood flow to the area. The cells die and combine to form the fat. I was also worried and realized that a lump that was growing that big would have been detected long ago by yourself or scans and check ups. Try not to to panic. But I had mine cut out. It didn’t hurt at all and really was not very moveable at all. It was a local anesthesia procedure. I wish you nothing but well. !

I had a licap flap lumpectomy where they took the skin from under my arm to my back (no muscle) and flipped it to fill in the spot where the tumor was. When I went to the ps he seemed very shocked that it was so hard. I can feel the whole flap of skin he flipped it is rock hard. He told me it was zombie tissue not dead but not alive but too soon to tell if fat necrosis. Now I am freaking out Because I start radiation soon and I'm told and radiation makes it worse and reconstruction is so much harder after radiation I really wish I would've had a BMX. And I'm very uncomfortable with this PS but he's a bigwig at the hospital so I'll be hard to switch to someone else as it would be awkward. But I really feel he's like being upfront with me. It's been six weeks since my surgery would he be able to tell if it's fat necrosis by now? Has anyone else had anything like that?

Thanks LAStar I start radiation tomorrow so we shall see how it all turns out.