Glad you were able to catch them. Hopefully you will be able to stop the problem. The supplement may still help out if their is stress due to a lack of something in their diet. Good luck and keep us posted.
Check list: Be sure there isn't any picking going on, nothing on the grass like fertilizer or such that might bother their skin, feed in good condition, no mites, plenty of shade and clean water. You could try a vitimin/mineral supplement like Avia Charge 2000. I give it to all my chooks and...