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Light case scratching is common and harmless at first. It's commonly due to bits of brass galled onto the die walls and it's caused by insufficent case lube to prevent the brass from rubbing hard on the die wall. Once galling starts it will only get worse until it does some real case damage if we don't remove it but it's easy to correct.
Simplist is to use the green pad 'pot scrubbers' from the kitchen. Wrap a snug fitting strip around a wood dowel, chuck it in a drill, add a few drops of bore cleaner to wet it and spin it in the die. Stop to test after a minute or so, repeat as neccessary. Don't worry about changing the die dimensions, you would have to take a lunch break for doing that. And don't worry about the resulting matt finish rather than a mirror polish, a matt surface holds case lube better and actually makes sizing effort easier.
Once it's clean, use a tad more case lube to prevent a recurance.
It's VERY hard to scratch a sizer; you can't do it with a file.
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