During puberty, some guys may develop swollen breasts or a growth of tissue under the nipples. While this might seem weird, it’s nothing to be concerned about. If it happens to you, don’t worry—it’s just a part of growing for some guys. It happens because some hormones cause the tissue at the breast to swell. It does go away for most guys, usually within two years. For other guys, it usually goes away by age 18. If it is stressing you out, ask your doctor about it.
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