I have 6 bantams that I rescued, the back story about them is in another post I’ve made previously. I’ve been checking them over ever since I found mites on them & after treating them. Today I noticed this flaky, yellowish skin under a couple of the bantam’s wings. I’ve also been noticing that a couple of them have been having lots of dandruff on the back of their necks & tops of their head. Also flaky skin that’s in a tube basically coming off of their neck feathers. Is this dry skin or something else?