Discoloration from rubbing or something else?

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.https://uploads.tapatalk-cdn.com/201...68521fde9e.jpghttps://uploads.tapatalk-cdn.com/201...a24c2d9b1f.jpg

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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.