Ive noticed for months one of my 13 chickens went bald?

[SoutheastAK_chickens]

Can you separate the roosters into a bachelor pen? Her baldness will get worse, and she is liable to get injured. I have used BluKote spray on bare heads to help prevent pecking.

We got rid of them a while ago. We only have one rooster now and problem is hes never mated her before I've been watching and he mates all but her it seems?? Maybe he knows somethings wrong with her? He doesn't even try. and she is still losing feathers on her head and im not noticing bullying at all.