Hi,Im a guy and Im 23 years old this year,height of 178 cm ,I have no specific medical history except physical injuries on the nose and shoulders.I have been taking mass gainer protein shakes and creatine over the pass 5 years and recently  i realise a growth on both of my nipples,my physician told its about the protein but did not mentione about it specifically.So,I sincerely ask if anybody would be able to reply me.Thank you very much.
Hi. Protein supplement can cause it but should not happen 5 years after the intake has started. The swelling is similar on both sides or is it unequal. Does it have a lumpy feel? Are you doing weight training, then it could just be the developing pectoral muscles. Do let me know. You can get in touch by using the Ask a Specialist icon. If it has a lumpy feel then it could be Gynecomastia which is also a harmless swelling of the male breast. Take care.  Chat Doctor.