i'm far from an expert, but a secluded section of dirty scales doesn't scream "scale rot" to me.
do they feel different from normal scales? any recent changes you can think of? substrate change?
don't panic just yet as this seems like an isolated issue. keep a sharp eye on it tho.
EDIT: looking over the photos again there are other patches of brown scales. scale rot happens not just from wet/humid conditions, but filthy ones as well. does this sound like your husbandry?
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