Nipple discharge can occur normally during the last weeks of pregnancy and after childbirth when breast milk is produced. A normal nipple discharge is usually a thin, cloudy, whitish, or almost clear fluid that is not sticky. However, the discharge may be other colors, such as gray, green, yellow, or brown. Usually, nipple discharge isn't a sign of breast cancer. A nipple discharge may look milky, or it may be clear, yellow, green, brown or bloody. Nonmilk.