I would suggest that you see your Dr. for a clinical breast
exam and possibly some type of testing (ultrasound or mammogram). breast discharge
that is spontaneous (without any type of stimulation such as squeezing) can be a cause for alarm but even then more so when it's from one breast
only. You do need to have this investigated though as breast
cancer in men is not all that uncommon. This of course would be less likely since you don't mention any lump in the nipple area.