Prolactin levels normal (15.51), breast discharge, pain, other sympt. why would i have discharge with normal prolactin levels?

Duct ectasia: Benign thickening within the milk ducts may cause some blockage of the ducts with a liquidy substance which can cause areolar discharge. This isn't necessarily related to nursing or pregnancy. A gynecologist can help make this diagnosis. Avoiding areolar manipulation can help. Other conditions can cause breast discharge as well and should be evaluated by a gynecologist.