Reformation Cream Backless Dress

Brand new Reformation dress, tags still attached and never worn. Size 2, made of 100% silk. Currently sells online for $350. There’s minor staining on the back (photo included). Not really noticeable in person, took close up photo with flash on. I haven’t attempted to clean it, but it may come out with dry cleaning. Purchased at a sample sale and didn’t notice the stain until after.