kk, about featherpicking - you know I have that rescue flock that came badly featherpicked - that was from boredom I think because the guy had raised them in the bedroom.
They started again after a spree of -30 weather when I kept them cooped up for a few days. I did make more room for them inside, got a feather block, added more activity foods, top dressed with meat grease, .....but I have been told it is a learned behavior and once learned will never go away.
Someone told me to cull the whole flock and start over
I did try something called rooster booster pick no more lotion on one hen. It worked. I don't like it - it is a) expensive, b)perfumey and I don't like to smell perfume on people let alone chickens, c) messy in the extreme, .....but.....it worked.
Also tried spritzing the hens with vinegar water, and I think that helped but it needed to be replaced about daily, and given the below zero weather and the fact that I was only seeing the hens in the dark because it was dark when I got up and left for work and dark outside when I got home, ...it was not a good solution for me at that time. I also felt skeptical about why it would work since they were getting acv in their water, but the spritzing solution is very strong so maybe the aroma?
I wouldn't want to spritz vinegar on open wounds either, though,
Keep us posted on what you try and what happens!