Sir , My Son Is 7 Years Old.during Eco Of

sir , my son is 7 years old.during eco of his heart he identified that valve is thick and like rhytmatic. he prescribed benzibiotic inj for one year. my question is wether this injection heals the valve or whats its effects on his heart valve.doctor saying his valve is leaking.kindly help me to know about it.what is valve leaking wether it is treatable.