Maybe there is a little confusion here but mouth rot (infectious stomatitis) is actually located INSIDE the mouth, so an open mouth picture would be necessary to identify it.
If your snake has mouth rot (again no way to tell here) treatments may vary from irrigation to antibiotics to surgery.
Now as far as discoloration of scales there can be various reason usually the most common are, chin being dirty (depending on the substrate used), natural change in coloration over time etc.
Those are below healthy range and needs to be addressed.70-71 cold side.
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