Live in South La. and have a lot of humidity. Had problems with this and sprayed Lamisil fungal spray - liquid - 1 x week for a few weeks and it went away. Looks the same from the picture. Good Luck and cover their eyes while spraying. Very small amount worked.
My Buff. Hen had this last year and now my Rooster. Had a lot of rain for about 6 weeks and showed up. Sprayed very lightly Lamisil fungal spray once per week for a few weeks until it was gone. Sprayed the Rooster last week, looking better. Watch not to spray in eyes. Good luck!
Well, not sure if you are having the same problem as me? Found possums, birds, raccoon's, etc. eating my feed at night as the chickens roost, I found possums and raccoons eating my feed at night and birds eating it during early morning hours, and who knows about snakes, etc. My brother in law...