I’m very worried about what seems to be a crack developing along my veiled chameleon Cosmo’s casque. I live in Chicago so the winters are extremely cold, in which case I use a different wattage for the heat bulb in the summer vs the winter. I have a good digital thermometer in his basking spot as well as near the bottom of the cage, when spring rolled around and we had an abnormally hot day I noticed his basking spot was way too hot - about 102 degrees, so I immediately swapped the lightbulbs and haven’t seen anything out of the ordinary in temperature since. Where his basking spot remains around 84-91 degrees. But the darkened front of his casque in the last 5 or so months has developed from just the very bottom, all the way up to the top. I’ve been to the vet & they said it wasn’t a thermal burn but I’ve seen on other forums this part of the casque being chipped off almost like a hang nail. All advice, opinions & suggestions would be greatly appreciated.