Nipple discharge can have several causes, and it is crucial to understand the underlying factors to determine the appropriate course of action. One possible cause of nipple discharge in males is gynecomastia, commonly known as gyno. Gyno is a benign enlargement of breast tissue in males, which can result in nipple discharge. It is important to note that gyno can be caused by several factors, including hormonal imbalances, obesity, or the use of certain medications.