I might be on the wrong track here, but to me, it appears that he scraped the middle of his back and the 2 darker lines you are seeing is actually
the contrast of where the scraped skin ends. Could also be discolored from the substrate, as C.Marie suggested, so try wiping him with damp cloth?
Your substrate might have stained him if it has added red/brown coloration.
In ANY event, unregulated heating is a huge no-no...if you snake gets burned it's horribly painful, slow to heal & potentially fatal.
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