can be due to many reasons - drug intake, endocrinal (hormonal) problems, metabolic causes or pubertal gynecomastia. Here there is enlargement of breast due to fatty or glandular component of breast.
Get serum testosterone, prolactin and thyroid profile done.
Medicines can correct gynecomastia only in cases of hormonal problems otherwise they are not effective.
Surgical correction of gynecomastia can be done by liposuction
and sos gland excision. It's a safe and near scarless procedure.