I am no pro. "Looks" to be burns, but can't tell for sure. I know you said you use a CHE in a cage, but even the metal cage itself, if the CHE gets really hot the cage can get hot enough to burn. Is she within range of touching or rubbing on the cage? If you have a IR thermometer, maybe try checking how hot the cage is. That's what it "looks" like for me. I'm just trying to give you something to look into as a source. I'm sure someone with more experience will chime in soon.
Regarding the injury, maybe someone can suggest what to put on it. You don't want an infection coming from that. Maybe get rid of the substrate for awhile, and keep on clean white paper towels to keep the wound clean while treating it.
A vet visit might be warranted if a burn, but I know how vet visits can become pricey.
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