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. The consistency of nipple discharge can vary — it may be thick and sticky or thin and watery.
WebMD explains breast and nipple discharge and what it might indicate. result in nipple discharge that contains blood or is sticky in texture.
brown or cheese-like, mammary duct ectasia (blocked milk duct) For example, it may be thick, thin, or sticky. Breast cancer can cause nipple discharge, especially ductal carcinoma in situ (DCIS), an early form of breast.