Not sure if he is ok.. help

[Tsubaki]

It could be a skin infection, fungal or not. What you could try is to clean out the tub, put the snake on some paper towels or newspaper. Dilute some betadine (1 part Betadine, 4 parts water.) And carefully clean the spot with that. Also raise the temperature slightly, and keep the humidity as high as possible without making the living area wet. Is he close to shedding? slight sounds can be made by loose pieces of skin in the nostrils as well.