Physicians who tell teenagers "don't worry son, it'll go away eventually." That's complete BS. Any adolescent with more than a lump under their nipple should be advised that in all likelihood it won't go away on its own and will develop into a psychologically debilitating condition known as gynecomastia. If the lumpy nipple persists for more than 3 months, the doctor should be prescribing anti-estrogen drugs to all adolescents who show signs of this condition. Sure, a few of those teens' gynecomastia might go away on its own, but the majority will not. Anti-estrogen drugs have proven in lab tests to eradicate gynecomastia in teens if caught early enough. If my physician had told me this I wouldn't be here, and neither would most of gyno.org's younger members. These drugs carry very little risk, and compared to the emotional and financial damages that would occur if this condition is allowed to persist, many parents and teens alike would most likely agree that the risk is worth it (if fully informed of the situation by the physician).
Another thing that pisses me off is health websites that say "boys, don't worry if you notice a little breast development while going through puberty, it is completely normal. You're not growing breasts, and it'll go away on its own". No, boys, it won't. You are growing breasts. Get help immediately. Talk to and endo, start saving for surgery, do SOMETHING. Just don't sit on your ass because trust me, after years of emotional torment and ~$5000 later, you'll regret listening to your "physician".