So about 4 days ago (friday 28th) i noticed some light discoloring on one of my ball pythons mouth. i monitored it over the weekend and noticed it get worse so i took some pictures today so i
could get some help.

both my ball pythons are in the same type of environment and this one is the only one with a issue.
Terrarium conditions:
91 degrees hot side/ 80 degrees cold side
56% humidity
orchid bark
water changed out everyday or every other day.
UTH with thermostat and a elevated heat lamp.

sorry for such a large pic i took it with my phone.