

Figure listed as brand new has stains
It came properly sealed and everything. But there's a mark below the right eye (1st pic) and on the right upper leg (2nd pic). The stand it came with is pristine though.
The seller is very reputable and runs a shop selling loads of figures. Not a single bad review. Some of their stock is listed as "used" so I'm confused if they knew about this. The other figure I got from them was fine and brand new.
What are those stains, should I be worried? Is it mold or just dirt/degradation? And how should I approach cleaning it?