My salmon faverolle, Tootie, had a bald back for months…I assumed it was from my 2 roosters. It was summer and her skin would get red from the sun and raw from the rooster scratches so I sewed her a little jacket. I think I applied some chicken balm a few times to soothe the skin. It took a few months to grow back in but it finally did.
The first pic is from when it was the worst - that’s when I made the jacket (2nd pic). I made it with very soft, elastic material and she didn’t even notice it was on. The 3rd pic is when the feathers finally started growing back in. Now some of my girls have bald little heads - I guess they are the rooster’s “favorites”

. I would just watch out for too much sun exposure - even on overcast days.