Wow, animal cruelty at its worst. Even if it was from ignorance this is pitiful. I suspect deep tissue burns with a secondary Infection. I am surprised to hear the reptile is moving and alive. Kudos to you on the rescue and vet intervention. The reptile is probably septic and will require antibiotic therapy and surgery. He is a strong animal to still be alive. Yeah, paper towels as the substrate and ( tea colored) betadine soaks twice a day. You can even alternate with Chlorhexadine soaks on following days. Vetericyn as a antibiotic application or neosporin ointment w/o pain relief. The betadine soaks should be followed by clear water rinse. Chlorhexadine doesn't need to be rinsed off. Hoping for the best healing and rehabilitation. Good luck.