It's a SolarGlo by ExoTerra - 125W; apparently meant for arboreal species. The problem is that she's in a screen terrarium. My sister had bought this 38 'Gallon" Apogee Reptarium as a short-term solution until she could get a normal vivarium. The chameleon can climb all around this thing, since the walls are mesh, and her favorite spot is up in a corner about 5 inches from the bulb. Granted, she's shaded by leafs, but there's really no way we can stop her from climbing up there. If it is indeed a thermal burn, the problem will be solved within the next few days, as we'll be replacing that crappy Reptarium with something more suited to this Cham's needs. Again, supposing it is a burn, is there anything we can do? She doesn't seem to be in pain, and has just shed (the spot remained after the shed). I'll try and get pictures up ASAP, but she's rather elusive; she's new and is still going through relocation stress, so it's hard to get near her.
Also, this is kind of off the point, but along with the whole relocation stress deal; how long does it take for chams to get over this? At the store, she was hand-friendly and was all too eager to climb onto people, but now she's secluded and hisses at any sign of a hand near her. I personally own a Bearded Dragon who went through the same thing, and it took him a little over a month to get used to everything. Can we expect the same for this cham?