Woke up this morning and was misting my frogs when I noticed this on the side of one of their mouths.
What is this?? Should I treat it or let it heal on its own? She does not seem to be in any pain and is as active as usual.

Only recent changes to the tank are replacing coco fiber substrate with water.
Every feeding is dusted with repashy calcium plus. Other side of her mouth is totally normal, and none of the other frogs are displaying anything similar.
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