The following will list the categories of the current post type. If you want to exclude one of the categories so it does not show add this:
The following will list the categories of a custom post type. Code Credit to: http://www.paulund.co.uk/display-categories-of-a-custom-post-type
The following snippet will display the categories in a list for the post. The comma in the parenthesis separates each category with a comma.