I recently noticed a bald spot on my Delaware chicken's back. It's not very big just looking at it but when I spread her feathers I saw that many more feathers were missing. She's been acting fine, she doesn't seem itchy and isn't over preening, she doesn't get picked on my anyone else in the flock, she's laying normally, etc. I thought it could be lice or mites but no one else is losing feathers so I'm not sure. If anyone has any thoughts or fixes it'd be much appreciated!