Hello Yuyee and welcome. Thank you for requesting me. I'm sorry to hear that Tib is ill.
I know you would like a home remedy, and I would love to give you one, but unfortunately, this is a situation where there isn't one. This is a medical emergency.
A red, pink, or orange tint to the skin is often a sign of septicemia - blood poisoning. It could be the result of a minor wound that wasn't even visible. It must be treated by a vet. You can read more about septicemia by scrolling down about 1/3 on this page:
This link will take you to a directory of reptile vets:
There are other possible infections and organ conditions that could be responsible, but evey one of them are serious, and require immediate care.
If you have more questions, just let me know by clicking on REPLY. I hope Tib will reach a full recovery.
My goal is to provide you with excellent service – if you feel you have gotten anything less, please reply back, I am happy to address follow-up questions. Please remember to rate my service only after you have all the information you need. Thank you!