My andalusian pullet (about 4 months old) has face skin and comb that looks whitish. She seems very healthy otherwise. She forages, poo looks good etc. What would cause this coloration in the face and comb? Is it a skin disorder that I need to treat? Dry skin? Deficiency of some sort, tho I can't see how THAT could be possible, with all the different feed I give them. Layer pellets, 5 grain treat, veggie scraps, and free range several hours a day, plus a huge run and coop for when I am. Ot home to supervise the garden. And ideas? Advice?