>>1840502colostrum is not pus, although it may resemble and feel like it. discharge in non-pregnant women may potentially be a symptom of a deeper issue but can also be completely benign, in this case likely being caused by nipple stimulation. as for it being green, the color varies naturally and can be affected by diet. it's not unusual for breastfeeding women to produce green, blue, or even purple milk.
pic unrelated, not medical advice, see a real doctor, etc;