My snakes have suffered with both but with the pics that you have posted its very hard to tell. try and get a closer pic. if it helps pop him in a small clear plastic container and take some pics that way.

I got a small bottle of mite spray from the pet store cleaned out the tank thoroughly, soaked the snakes in warm water. spray the snakes and the tank with mite spray. best putting news paper or plain paper for substrate. keep cleaning and spraying with mitespray.

If it is scale rot then i cleaned out the tank, wiped the snake down with a slightly damp cloth to make sure it is clean and i wipes it down with inodine wipes from the hospital.

just post clearer pics up so we can let you know which it is.

Lulu xxx