parasite? bacterial? fungal?

[TrixieTang]

cant tell what this black spot is in my cham, fuji. hes eating plenty of crickets w calcium no d3 no sunken eyes hes drinking water frequently. just worried as to what it could be.
sorry the image is a little fuzzy the camera on my phone doesnt work so well. it doesnt look fuzzy like fungus it just looks as though his skin has changed that color

 

[johnnyev]

Hard to tell from that pic. Could it be a burn?

 

[Montium]

could be a burn, have you checked the temp at the hottest point in the cage?