So I had a friend hatch out some chicks for me, and I'm noticing that they're still missing a lot of feathers on their head/neck area. There were a few mysterious deaths in this hatch between the ages of 6-10 weeks (chicks were found dead on the coop floor in the morning). I am supposed to get the two remaining chicks from him sometime in the near future after he has treated his whole flock and coop/run for mites. He has already treated the whole flock with corid and dewormers, and has been giving vitamins as well (after the corid treatment of course). I was just wondering if anyone here with more experienced eyes might be able to give me some insight about what might be causing these bald spots? The little red pullet is ESPECIALLY bad, and her feathers overall look tattered.
Thank you in advance for your help, I appreciate you all. 

