Hi there, I am quite new to backyard chickens. We bought a house and inherited some. I have two of the originals and recently bought 3 pullets from a 4H group (2 from the same farm and one from a separate farm). My black australorp was very pretty, bright red, perfect comb. I have had them for about a month or so and noticed the comb showing a few black spots. No scabs. Now the comb has white areas and almost a frosty look. When I bought her the previous owner sprayed her for mites. She acts normal and I believe has started laying. I am wondering whether this is stress related or a disease. I do not have any vets in my area that treat chickens so don't know what to do. Please help!