Redness as the one and only symptom?

I decided to set my own topic and describe my story in details. First of all, I come from Poland, I am 30 and have a 5 year-old son. I couldn't breasftfeed as I went through a severe case of preeclampsia and after cesarian i didn't have much milk. then, I had an infection and took metronidazole so they told me even if I had had some milk I couldn't have breastfed my son. My first period came when I was 13. I have always had long cycles, massive bleeding during my periods. I suspect I have too much estrogen or lack of progesterone but I haven't done any blood tests yet to confirm that. Before pregnancy I had been taking oral contraceptives for 1,5 year and soon after I had stopped taking them, I got pregnant. After pregnancy I was also taking contraceptives. During my life I took them for 4 or 5 years in total. I stopped taking them 3 or 4 months ago. After pregnancy my cycles are rather regular 28-30 days, but it's always massive bleeding. I have never smoked, I haven't been drinkning any alcohol for about two years, I try to exercise a lot, I keep a healthy diet. I weigh 106 pounds, height 5'3. I have no cases of bc in my family history.  Ok, this is just a long intro about me. Thanks a lot for patience.

Now, let's come back to the breasts ...

Last December I saw a small, dirty stain on my bra, I knew that was some kind of a leak from my left breast only. It happened only once but I did the US immediately, it was clear. I also went to the oncologist just to make sure. She said that everything was ok and this could be the rest of milk after breastfeeding ( I never breasftfed, I gave birth 5 years ago... and I told her about it but she didn't say a word). The onco doc advised me just to do the US every year and observe. Then, after I had given up the pills ( contraceptives) I started having strange, rather strong pains just in the left breast, the one I had had problems before. I visited the obgyn , he told me to check my prolactin and do the US again. The US is ok, so is the prolactin level and I soon started having watery leaks from the both breasts. The pain in the left one is constant, but more severe during ovulation. And a few days ago I saw redness, again on my left breast, it stopped hurting, though. The breast isn't bigger, it is not warm, no swelling, the nipple is OK. Just the redness, or pinky look maybe. I put some steroid ointment on it and it got much worse. Now I think it has almost disappeared but still visible. Should I go to an oncologist again? I read that the redness can come and go during this type of cancer, maybe some sisters who experienced it could tell me. Did it go away after they started taking antibiotics or went away without any treatment and then came again? I have to mention again, i still see some kind of slightly pink area, very light one. The breast is not as whote as the right one.