I have 4 hens (3 red sex links and 1 Dominique) and one Maran rooster. Got all 5 as pullets last June. They are kept in a coop that is attached to an exercise pen about 6 ft × 6ft. We live in Florida and our ground cover is mostly sand. Their home is under a large oak tree. I noticed one hen looking a little thin so I picked her up.and found that she has bald patches and scabs under both wings. The other 3 are the same, although the wounds are not as bad yet. My rooster is not missing a single feather. Their skin and the base of their feathers look healthy and clean everywhere else on their bodies. Could this be an ectoparasite or a fungus? Or could it be the rooster? He's a bit bossy but I haven't seen him behave badly with the hens.