Advertisement My Hadrurus arizonensis has had a white crust growing on her chelicerae for several months now. I keep wiping it away from her mouth parts with a cotton swab, but it keeps growing back. I just found a patch of it that has spread past her mouth, under her prosoma. She hasn't been eating for a while either, but I'm not sure if this is related, or just normal fasting. At this point it's obviously an infection or parasite of some sort, but I have no idea what kind. Perhaps it would be best just to euthanize her to prevent it spreading? Any advice is greatly appreciated.