Khoshekh is a pied hen, around 16 weeks right now. I purchased her as an 8 week old, and she started to develop the ridge a few weeks later. It's formed entirely of excess feathers. It will not smooth down.
(Posting a link because for some reason mobile will not let me add pictures directly)
http://imgur.com/a/M1Jri
(Posting a link because for some reason mobile will not let me add pictures directly)
http://imgur.com/a/M1Jri