Brahma "chick" missing feathers on back

[technolaser]

Hi everyone,

I have a 6 week old Brahma (hopefully hen!) and although she has lovely feathering, there's a strip down the middle of her back where there are only the bases of small feathers. She's been like this since I got her at 1 week.

I've monitored her and no one ever pecks her back nor does she peck herself at all.

Any ideas what might cause this or what I can do to help her feathers grow?

Thanks to all.