What causes unilateral nipple discharge in a male?
Patient: Hello.  I am a 22 year old male.  About 9 months ago, maybe more, I noticed in the shower that my left nipple was sticking out farther than my right.  I promptly squeezed it and it had a discharge much like a pimple before it was empty.  After this, nothing else came out that day, but the nipple has remained larger on the left side, and occasionally (once every few days,) if I squeeze it, it will discharge a tiny bit more.  I cannot identify any lumps of any kind to indicate gynecomastia or breast cancer, and am really stumped/concerned as to what else could possibly be causing unilateral nipple discharge in a 22 year old male. Doctor: Dear, We understand your concernsI went through your details. A women can normally have some type of nipple discharge throughout her adult life. For men, nipple discharge can indicate a problem. During hormone imbalances such as adolescence, the male gland can be stimulated. This hormonal stimulation can result in gland growth (Gynecomastia), tenderness, and produce milk and or nipple discharge.If squeezed / traumatized enough, a clear fluid can be express from almost anyone. This is normal but hurting tissues this much is not a good idea.With gland stimulation, the discharge can be milk like or thick like a pimple. Nipple discharge is a concern if:bloody or fluid colored red, pink, or brownlooks like pus especially accompanied by inflammation and or feverone sided (unilateral)happens without squeezing the glandsticky and clear or a cloudy black or brown.I suggest you not to try diagnosing your problem. Please consult a surgeon.If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute detail possible. Hope this answers your query.  Further clarifications are welcome.Good luck. Happy New Year. Take care.