Breast tissue growing back?

Whateverittakes

I had a BMX with skin & nipple sparring in June 2018, July the left nipple & skin flaps died & had to be removed. During all this time I was unable to take any of the tamoxifen I was prescribed due to the risk of DVT'S. Flash forward about 3 weeks ago, I broke out in a horrible rash from my chest up that I still currently have. At this time of the ultrasound I didn't have a lump.i was told all clear just scar tissue. Then I became really sick about a week and a half later, rash becomes worse & painful, shooting pains in the left breast side. I went to the hospital knowing something wasn't right. I was givin a biospy due to the lump growing so quickly. It's feelable, and you can see the perfect lump through my clothes. Its also my original lump that sent me to the hospital the first go aaround. Im awaiting the results. Mean while the Dr. Failed to tell me when he ordered the ultrasound he SAW my breast tissue was growing at a rapid rate! At this point I have in my mind, was the first diagnosis correct? Do I have IBC? No skin biospy had been done prior. I was completely unaware of the breast tissue growing back, especially this fast! Any info on this subject?? Thank you for your help. SA