Gynecomastia is fairly common in male teens. I'm not sure what the kid looks like, his medical history, family history, how long it's been going on, what meds he's on, or what his labs look like. But I'm not surprised the doc just dismissed it. It usually disappears on its own in time. T and E2 levels in kids have different normals than adults. Basically, their hormones are all out of whack throughout adolescence. Which is a big reason they're a pain in the ass. And also why gynecomastia develops. I never once saw a kid treated during my rotations. Not to say they wont be treated. But it's definitely not standard of practice to do so at an initial visit with a primary doc. Certainly changes when you see a specialist.

He may have had soy milk when he was a baby which attaches to the estrogen receptors causing feminine characteristics. Even if he didn't use soy as a child, tell him to stay away from soy. Tell him to find a specialist and don't take matters into his own hands, cause if that got out he could have legal problems. A couple things that might help while he is waiting on medical advice would be ginseng helps hormonal balance and nettle root extract is somewhat of an aromatase inhibitor.

I had one large lump removed at 18 the other side treated with nolvadex as flared up every few months. Obviously well before I started on the gear. It was due to abnormally high testosterone, and obviously converting to estrogen. I was muscular and strong but wore jumpers during the summer to hide my 'tits' until finally they just became too painful for me to do sports like running. I used to get asked at 15 what gym I went to when I had never trained. I wish I had had surgery earlier as scar would be smaller and that they had done both sides as when I get itchy nips during test run etc it's only on the un-operated side. If it was my son I'd say he's getting bullied etc and do they want to end up being responsible for any mental effects from that. If that didn't work, I'm in the UK and would go to Citizen's Advice (free service for legal help) and see if have a case for medical negligence. Obviously I would tell the doctor this before doing so, and see what his response was. I would NOT in any way try to treat them myself. No way would I be responsible for messing around with my child's endocrine system! Not sure what country you're from but threaten to report to medical board for malpractice. Also if it's through medical insurance surely delaying the issue may result in a much higher cost for the insurance company, so I'd lean on that. Oh and threaten to use social media, surprising how that can help. Feel for the kid cos I hated it. Mine wasn't quite so obvious as muscle was around it from press ups etc but having a six pack at 17 and tiny breasts wasn't a great look. Remember wearing vests with words on the chest to 'hide' it. Wishing him all the best

This post bugs me. Because too many doctors ignore the big picture.
Kids are brutal. So I can't imagine what this boy is going through. 62 for estrogen isn't that high, but it is elevated. I'd bet anythjng that prolactin hasn't been evaluated.
I've recently done a ton of research on prolactin. Too often the medical community ( and even ourselves) ignore the consequences of low prolactin. A large portion of try patients could be prevented with proper prolactin evaluation. I've been too busy lately, but plan to do a write up on it.
Regardless of the cause, if it were my son, I don't think I could tolerate dome Doctor saying deal with it. If it were myself, I know I'd monitor bloods and do what I felt needed to be done in the interim. It gets sticky when an adolescent is involved. In my opinion, that makes the practitioners attitude about the situation even worse though.