you need a vet trip asaap if that's not debris or old food. but to help sooth theres a reptaid treatment thas you can rub on with a q tip. but you need a vet trip. the ncheck the humidity in your cage to make sure its not to high. you need to let your cage dry out after you mist. make sure you keep the cage clean..thats the best way to prevent this sort of thing. and in the future you want to dust acouple times a week with a dust called rot guard. its great stuff I use it as a prevention messure