My wife noticed 3 of our hens, a buff and 2 barred rocks are loosing feathers on their back, just behind where their neck meets the main body, if you can imagine the part of their back that is sort of horizontal when they are walking, near the neck though. Inspected one of them and got this pic, not very good I must say. Saw no evidence of mites, just feather loss and some redness on the skin. We have a white brama rooster in the flock too. Could he be the culprit? All are right at a year old.