S.F.
Many women have breast cysts. It's very common to have them. I found my first cyst when I was in middle school. When I was about 20 I had a biopsy on it, and they said it was just a cyst and benign. I think it was around an inch wide. I also had more lumps in my breasts around the time when I had my kids. The mammary glands can become clogged. Even after I stopped breastfeeding I could feel it. Eventually it worked itself out after a year or two it is gone.