DwB… aromatase is abundant from fat cells. As the cells empty from weight loss so goes the enzyme. I wound up with gyne from an unknown rapid loss of T during a weight loss period. Confusing at first because I was slipping into a MEN syndrome causing hypogonadism. All of my T was converted to E for many months. After the weight was gone there was no T and no E. But I had a nice pair of breasts. Went on to manifest other MEN syndrome events. Too long of a story to cover again but osteoporosis is now being averted with HRT with an Estrogen patch. The recent Dx of a cranial tumor, Prolactinoma, explained the continued breast growth in the absence of estrogen. Recent US scan confirms bilateral testicular masses, so orchiectomy in 2 weeks. All this to explain why we need to be very proactive on discovering the cause of gynecomastia. Most here may be idiopathic or genetic predisposition. But there are a multitude of other factors that are involved and need to be explored. I hope your Doc just doesn’t wave you aside and your curiosity has you explore deeper. You are young and have many years to go so be healthy …