I noticed these brown spots on this ball python's tail/belly, which I dont remember seeing before. I tried wiping them off with a warm wash cloth but they didn't come off. She isnt my ball python but im looking after her for my teacher over winter break. She ate a live rat 6 days ago but has not pooped yet, and she does not have any heating or humidity control (not my decision, but i unfortunately dont have the money to buy things for a snake that isnt mine. i asked if my teacher would give me a heat lamp but he said it would melt her enclosure). I'm not sure if these could be causes for this or if its even a problem, but i figured the information could help. Should I be concerned about this, or am I worrying over nothing?