I've read that using a product like Blu-Kote can discourage pecking at raw, red skin. I don't have actual experience with this, but there are horror stories (some on byc) about hens cannibalizing each other after picking off the feathers. It can get very bad.
I made a mix of Bag Balm and gentian violet (the blue stuff) for putting on sore areas -- it seems to slide right off, though, so I can't recommend it.