Sorry these aren't great pics but my bald baby is the one on the right
And in this one you can see her naked spots (she is on the left)
Her neck, back, and the back of her wings were naked for a long time
I thought it might have been the roos, but she stayed like that even with out them...
I don't know...
I did get a barred rock that was about 3-4 weeks that had the same kind of issue... She had bald spots here and there... She ended up getting in all of her feathers and fluff in a month or 2.
Good luck!