Filter the first result of the PHP function explode and present in a structure

How can I delete the first result of the explode. Converting to array , $separa[0]; can filter, but with difficulty to delete it from the foreach structure.

Example:

$separa = explode(",", $row['referencia']);  

$separa[0]; //obtenho o primeiro resultado

foreach($separa as $ref ) : 

      echo$ref; //imprimir sem o $separa[0]; (primeiro resultado)
;