Scale Rot? Or something else?

[Fazer72110]

What did the guy you bought him from use as substrate ? Because that looks like nothing to me so much as ink from newspaper, maybe rubbing off there because that would what gets damp/wet when the snake drinks.

It certainly doesn't look like scale rot.

He was using aspen. He shed the beginning of this week, but I noticed it after. If it was there before and didn't come off with the shed could it just be natural discoloration? It just looks really wierd.

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