Nipple discharge is another potential indicator of gynecomastia to be aware of. You may notice a spontaneous clear or milky fluid leaking from one or both nipples. This happens when the prolactin hormone stimulates the mammary glands due to the accumulation of extra breast tissue. The discharge often affects both breasts, but you may first observe it coming from just one side. The leaking can occur randomly or only when pressure is applied to the nipple. The fluid may be sticky, crusty, or watery. Bloody discharge can also be a sign of breast cancer.Since hormone changes, medications, health conditions, and other factors can trigger tissue growth, you should make an appointment with a doctor if you see these signs. It is crucial to determine the cause and treatment options.