Fortune + Ivy Christelle button down too small NWT

Brand new Fortune + ivy blue and white button down, with tags, never worn There is a small mark on the inside of the left side of the buttons (as seen in photo). It is very small, not visible when the item is worn. Since it is NWT I have not tried any stain removal so that might work, but as mentioned, it’s not visible while wearing. Listing comes from pet friendly home.