Hi, I live in Central California and have around 50 chickens, many of them chicks. I have everything from various egg layers to my project birds, Modern Game Bantams and Showgirls. I've had chickens for over 20 years and my 2 oldest girls are around 13 yrs old.
I've got a black silkie who developed a white face while sitting on eggs. I didn't notice it until the eggs started hatching and I was checking for babies. I swabbed her face with an apple cider vinegar solution and have added acv to everybody's water daily. Her face looks better, but still...