Irritated tissues are common places for deposits to gather. If you have been breast feeding or have flare-ups of pain after your cycle, make sure you're getting enough vitamin D/calcium. It's important to take them together; vitamin D allows your body to absorb calcium.
Now a days calcium deposits in breast tissues are not uncommon. Sometimes it is an early symptom of breast cancer. Calcium deposits in breast tissue is also known as calcifications. It can be detected by doing a mammogram. It can also be the result of aging. In mammogram calcium deposits in breast tissues appears as small white spots.