6 year old son has frequent Nosebleeds, it started when he was 18 months old, at first it occurred rarely but the frequency increased later on, he would have Nosebleed once a month, recently it occurs more often, sometimes it happens when he is sleeping ( not because of nose picking) he doesn't have cold at the time , it occurs randomly , sometimes it is a few drops, but sometimes he has a bit of heavy bleeding, we have shown him to ,2 ENT surgeon, they said it was not concerning and told us to apply neosprin, is this normal? plz advise