Discoloration from rubbing or something else?

[andrewross8705]

To save everyone time, I'll be calling in the vet in the morning when they open just yo be safe.

With that out of the way, I noticed this on Kalinda tonight when moving her to a different tub. It looks like an injury that's healing from rubbing against her tub but I'm not positive. No bubbles, saliva or other signs to indicate mouth rot but I wanted to get some opinions in the meantime.

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[Oramis]

My albino hognose has had this happening on and off since I purchased him from his previous owner a few months back, did you ever find out what it was? He doesn't display any other issues related to RI or Mouth rot so not sure what it is.