You're welcome! and i am not sure what sickness it would be. he may also be shedding, just keep watch, or if you get really concerned take him it a vet. it would probably be the best option
I will probably leave it bare, i have a mesh reptibreeze cage, i am not sure what they used for the bottom its kind of a plastic type stuff. at that ok?
Okay try putting even more plants in the enclosure, vines and long thick plants should work, If this continues you may want to take your chameleon to a vet. I hope this helped! :)