Ok, so my sister was pregnant back in 2005. She had her son in November, although he was stillborn. She followed up with her dr.'s after the pregnancy, and she was fine other than being on iron pills for too much blood loss during delivery. Now, to this day she checks her breasts monthly for lumps or anything abnormal. Every once in a while she will have some "milk" or whiteish fluid leak out. Its not much, maybe a drop or 2. But, the last few months, before the milky fluid comes out, there is a drop of "greenish" fluid that comes out, before the white starts to come out. Is she OK? Maybe an infection or something? I want her to go and get it checked out, but she is certain she is fine. Has anyone ever heard of this before, and what is it, and or what causes it? Thank you!;)

This is from the MayoClinic.com website:

Nipple discharge: Rarely a sign of serious disease
Unexpected nipple discharge can be worrisome, but it doesn't often indicate a serious underlying disease. Here's a look at common triggers of nipple discharge.

Because your breast is a gland, your nipples may occasionally secrete fluids, even if you've never been pregnant. Cancer is rarely the underlying cause, but other conditions that require treatment may be. To find the cause, you'll need to see your doctor.
What is nipple discharge?

Unless you're lactating, fluid seeping out of your nipple is referred to as nipple discharge. Non-milk discharge comes out of your breasts through the same nipple openings that carry milk. On each of your nipples is a cluster of about ten of these openings.

One or both breasts may produce a nipple discharge, either spontaneously or when you squeeze your nipples or breasts. A nipple discharge may look milky, or it may be yellow, green, brown or bloody. The consistency of nipple discharge varies from thick and sticky to thin and watery.

Your chances of having nipple discharge increase as you get older and with the number of pregnancies you've had.
Your doctor's assessment

When you go to a doctor to have nipple discharge checked out, you'll need to give a detailed description of what's going on. Specifically:

* What color is the discharge?
* How much discharge is there?
* Does it happen in one or both breasts?
* Does the discharge appear to come from one opening in your nipple or multiple openings?
* Is the discharge spontaneous, or does it happen only when you squeeze your nipple?
* Do you have any other signs and symptoms, such as fever, redness, pain in the breast, headaches or vision changes?
* Have you recently experienced an injury to the chest?
* What medications do you take?

Based on this information and a physical exam, you might need additional testing to help pinpoint the underlying cause. Such testing might include a blood test, mammography, a breast ultrasound, a special type of X-ray (ductogram) or magnetic resonance imaging (MRI). Your doctor might collect a sample of the fluid to send to a lab for analysis. However, even after lab analysis, further evaluation may be necessary.