Until the vet visit consider switching the reptile onto a white unprinted paper towel substrate. I’ve seen it ( infected scent glands) in my colubrids at different times. Never in my ball python collection however. It’s very possible that it’s something different. Are you able to post pictures of it? Sorry to read about the situation and glad that you’ve taken a pro response to it by seeking reptile veterinarian assistance. Congrats to you!
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