Does the discoloration continue onto the belly or not? Hmm.. Doesn't look 100% like a burn to me, but just to make sure all the bases are covered, you're regulating your heat source with a thermostat, right? Also, is there any way he could come into contact with the heat source or metal directly heated by the heat source (like if you have a lamp on a cage top)?
'Scale rot' generally happens on the belly and is due to unsanitary or too-wet cage conditions and usually appears brown rather than red. However, bacterial skin infections can also look red. Without more info on exactly how you're heating the enclosure, I wouldn't rule that possibility out entirely.
Regardless, this doesn't look too serious at the moment. I think it'd be a good idea to swab the area with betadine (totally harmless disinfectant) just in case; if it's an infection it'll combat it and if it's a burn it'll keep infection from setting in. Keep an eye out for any changes in the size or color of the affected area and in the meantime do a good double check on your heat sources.
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