Praise be to Allah.
We asked Shaykh ‘Abd-Allaah ibn ‘Abd al-Rahmaan al-Jibreen the following question:
A person has breasts which resemble a woman’s breasts. Is it permissible for him to have surgery to reduce them?
He (may Allaah preserve him) replied as follows:
You must try to lose weight, then the fat around the breast will be reduced.
If what you have is not a result of fat (and it is causing you trouble), and you can do an operation to reduce it without any harm involved, that will be OK.