One of my chicks had yellow patches of thick buildup mostly around its butt however there’s some near its neck and under its wings too. Eating, drinking, and pooping normally. I have adult hens and have never seen this before. The other chick housed with this chick is not having the same issue. I was thinking maybe mites but idk because the other chick would probably have them. I was also thinking vent gleet but then the buildup under the wings and neck wouldn’t align with that would it?