Remove Extra Characters from API embed

First of all great job on your api for embedding ES fields into other pages. However I'm having an issue with extra characters showing up in the custom field type: Multi Dropdown List:

1. I have created this field in Profile types ES
http://www.awesomescreenshot.com/image/415864/822eef5a1f9c570ce3e036e1464d9e44

2. Im using your API (as given by your developer doc) to embed this into another page:

<?php $userId = JFactory::getApplication()->input->getInt('user_id');

	$key = 'ARTMEDIUM'; 

	$my = FD::user($userId); 

	$fieldData = $my->getFieldData($key); 

	echo $fieldData; 

	?>

3. However you will see in this screenshot that extra brackets and Quotes appear with this field type. This does not happen on other fields for example a text field. (Note: I'm good with the commas) but how do I remove the brackets and quotes.
http://www.awesomescreenshot.com/image/415870/7c200d024d9b02081b90b616fff904c7

Thanks!