I'm glad he's getting better. However, for anyone else reading this, there is no evidence one way or the other that this was not a burn or a fungus. You mentioned your basking spot was 93 degrees F, which is too hot for young veileds at that age by about 10 degrees F. I am still convinced that this was not simply hyperkeratinization as a response to UVB since that is a very uncommon presentation. So uncommon that I've never even heard of it in chameleons, and others on here with much more experience than I have never seen it. Just because it says that could be an effect on the box of the bulb doesn't mean that it's an effect that is seen in this species. Just because it conveniently went away when you moved the light doesn't mean that was the cause. It's like saying people with lung cancer always have cigarette lighters in their pocket, so the cancer must have been caused by the lighter! No, it was caused by smoking, and smokers generally have lighters with them. The cause was not placed correctly. The problem with your cham may have just run its course and is now time to shed. It could be that he appears lighter because he's about the shed. They characteristically appear lighter as lymph fills under the loose skin before it's lost. Hopefully the skin underneath will be normal, but if it isn't go to the vet.
I'm sorry if you're offended by our suggestions, but we are only looking out for the best interest of your chameleon. And I would hate for anyone else reading this because their cham has a similar lesion to think it was simply a benign condition that rarely happens, if ever, and ignore it. You cannot say definitively that the UVB caused this appearance without any diagnostic testing so you cannot say that it is confirmed that this was the only cause. It's a technicality yes, but important for others to know that.
Like I said, I hope for a full recovery regardless.
