I brought the two chickens in the basement with food and water. They act fine but the one has no skin left on its neck and head and you can see muscle. The other head is pecked and has no skin. I feel terrible. Keep them in a warm, dark area and keep them quiet.
Younger birds are especially vulnerable to attack and even even be killed by older hens.
It is important to keep all edges soft. Some skin will regrow very well,and feathers may or may not appear again. If the skin with the feather follicles is gone, you may have some bare skin, but this doesn't bother the chickens. It may not look so awful after the initial trauma lessens. I have a knot in my stomach just thinking about going home from work and having to deal with it.