Hi and welcome to HCM.
isnt unusualy and in most cases this is not serious. This is secretion of breasts glands which are hyperactive in some women. SOmetimes it can become infected or abscess
can form,but sometimes there is no specific microbe or infection. In rare cases it can be sign of tunour,adenomas or cancer. You can do mamography or ultrasound
to rule this out. ALso you should do hormones levels(estrogem,prolactine,oxitocine). Hormonal
imbalance can case abnormal breast symptoms too.
After these tests I am sure everything will be clear.
Wish you good health.