Brown spot on Atlas's head... "sun" burn??

[LilyPad]

I noticed last night during feeding time that Atlas, my male grey tree frog, has a brown spot on his head. I have had 2 new lights on the tank since last week, the original lighting I had went kaput. I'm wondering if his head could have been burned by one of the new lights? What do I do if that's the case? Right now, I have NO lights on because I have no idea. I have been using an LED light - Amazon.com: KLTECH NEW 48 LED White Blue Light 3 Mode Fish Tank Aquarium Clip Lamp: Computers & Accessories and then when it got cold out for a few days, the temps in my tank were dropping so I put a 15 watt incandescent to warm them up in combo with the LED. The problem is, he perches much higher than my girls and was much closer to the incandescent than the rest of them. Originally I used the Reptisun 5.0 Mini Compact Fluorescent Lamp - 13w.
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He seems to be plenty active, still chirping and eating, isn't acting like anything is wrong. He hasn't soaked at all except when I put him in the water dish for the pic, but he doesn't normally. I haven't moved him to the quarantine tank quite yet because his activity is still good.

He puffed himself out here because he was mad at me for sticking him in the water.



An old pic of the viv, basically the same with a minor change in a few plants, and now I bowl feed so there isn't vitamin dust everywhere.





1-size of enclosure - 35gal tall hex
2-# on inhabitants - specifically ( if there is another frog ---size differences ?) - 4, biggest frog is about twice his size, never bothers him
3-humidity- 60-70% depending how recently misted
4-temp - 68*F-72*F
5-water - type - for both misting and soaking dish - Distilled bottled
6-materials used for substrate - coconut fiber covered with leaf litter
7-enclosure set up i.e. plants( live or artificial) wood, bark etc -how were things prepared prior to being put into the viv - Viv has been established with plants for 3 years now
8-main food source - Crickets and occasional mealworms
9-vitamins and calcium ? ( how often ) Once a week
10-lighting _ explained above
11-what is, specifically, being used to maintain the temperature of the enclosure - explained above
12-when is the last time he ate - yesterday
13-have you found poop lately - Yes
14-a pic would be great ( including the frog ) any little cell phone pic is fine
15- how old is the frog - 1 yearish
16-how long have you owned him - 8 months
17- is the frog wild caught or captive bred - WC (feces were checked twice before moving him in with my other girls, all clear)
18- frog food- how often and if its diverse what other feeders are used as treats - crickets 3x's week, mealworms twice a month
19- about how often the frog is handled - almost never
20-is the enclosure is kept in a high or low traffic area - high