most helpful answer he may have adolescent gynecomastia -- an unwelcomed hormonal gift associate with puberty. this is relatively common but an embarrassment to boys. don't get me wrong. teen boys admire breasts but they don't want to grow their own. you can find lots of information about this temporary condition on the internet so you both can read it. this condition can last about two years and can involve both breasts not just one. there is nothing medically that can be done to stop it and nearly all will eventually resolve. i have seen thousands in my practice and only one had to have surgery to remove this breast tissue. if he doesn't want to take off his shirt at home or wear one at the pool let him. don't let other siblings or friends tease him either.
12 year old son has lump pain and clear fluid(when squeezed) in the right nipple. . no burising or discolorization