Hi, This is common in boys during puberty and indicates normal physiological hormone changes. The lumpy feeling under nipples is because of normal glandular tissue that becomes a bit prominent during puberty. Discharge is coming from the same glands. No need to worry, just reassure him that this is normal. Avoid squeezing, as this may lead to secondary infection and abscess formation. Take him to doctor if you feel the appearance is quite disturbing cosmetically, he develops pain or redness over there or the discharge becomes bloody/pus like. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Muhammed Aslam T. K., Pediatrician