I believe it was a curved bar, but I'm not a 100% sure, but it wasn't much of a curve if it was. It was honestly fine for months, it was only when I snagged it on something (I have nightmares and I woke up violently and snagged the jewelry on my quilt) that it started rejecting.
Find a piercer that will do it with a surface bar. It's a surface piercing and will heal better with proper jewelry. If you let me know where you are I can make a recommendation on a good piercer. I've been a piercer since 2000