this is adolescent gynecomastia. caused by his hormones. i see it every day in my practice that has a large population of teenagers. it is not the soy milk it is his ranging hormones. use both words "adolescent gynecomastia" in your search engine and you will find plenty of information. very common. temporary (can last a few years thought). i have only had one patient in 40 years that eventually needed surgery. the rest self-resolved hidden under a shirt for a few years.
does soy milk cause gynecomastia (man boobs)? . my son is lactose intolerant and drinks a lot of soy milk (as he is a growing teenager). someone told him it was like estrogen and would give him man boobs. is this true? ! thank you!