Nipple discharge besides breast milk, such as blood
It is normal for the nipples to produce milk during and following breastfeeding. If you notice discharges other than breast milk from your nipple, you should see a doctor immediately as this might be a sign of cancer. This discharge may be clear or even bloody. It may also be any color from green to yellow.
Not all nipple discharges [5] are caused by breast cancer. Breast infections, birth control pills, and other medications can also cause it. Still, you should only leave it be if a doctor has recently ruled out breast cancer.