found a cyst....but now need a biopsy!!!

Really hoping someone has had a similar issue. I have an extensive history of breast cancer. I have the BRCA1 gene- my mom had it and passed away over 20 years ago. When I was 33 I was diagnosed the first time on the right breast, stage 2A. I immediately had a mastectomy and tram flap reconstruction as well as chemo. When I was 37, I had a new primary cancer develop on the left side, once again stage 2A. Had a lumpectomy, chemo, and radiation. So everything I've been through defeats the odds. I just turned 40. I was really hoping to leave my 30s behind in a cloud of healthy dust, but two months ago we found a lump on the right side again. Long story short- it was fat necrosis, but had to go through a biopsy and everything. Two weeks ago, another lump on the left side. Dr wasn't concerned with how it felt but had me go for imaging. I had a mammorgram and ultrasound and had 3 different drs look at it. No one was worried. It was two cysts on top of each other. The radiologist actually hugged me because he was so happy to give me that news. It was the best case scenario because with cysts I didn't need to get a biopsy, as I had with the fat necrosis (because fat necrosis mimics cancer on imaging). But my dr did say to keep my eye on it, because it's not as common for women with reconstructed breasts to get cysts. I also had my ovaries out 3 years ago and cysts are common in women around their menstrual cycles. There's no real reason for me to have a cyst! But because of my past, my doctors are careful with me, so I was happy they weren't concerned and I just tried to forget about it.

Fast forward two weeks and the other day I noticed a red mark/light bruise on top of the skin where the cyst is directly underneath. It's about the size of a quarter. So to be safe, I went in today to see my doctor. He said that the area now felt firmer and a little bigger so he wants to biopsy it. He said he's planning on doing an ultrasound guided procedure. He said if he still only sees the two cysts, he will aspirate them. He said that it's possible a cyst is infected, which would explain the red mark on my skin. And then he'd just give me antibiotics. Or if it's just regular fluid, he will be able to tell immediately if it's suspicious. Now, of course I go home and google infected breast cyst and what comes up- inflammatory breast cancer. And I'm also reading that sometimes a cyst is formed because there's breast cancer under it. And in between the two cysts is an area of dense tissue.

So I'm really freaking out. My biggest questions are why do I have a cyst since I don't have regular breast tissue? And why do I have a red mark on my skin on top of the cyst? These are my biggest concerns. Really hoping someone can talk me out of the possibility that I might have cancer again.