I've just sold an unworn, new, with tags. white dress on vinted. I was about to wrap it for posting and I've noticed a tiny dark mark on the skirt part. I've tried dry cleaning stuff on it but it's still there. Do I mail the buyer to let them know? Remove it from sale (can I at the point?)?. Reduce the price, or just send it anyway? If you look really hard at the photo I've noticed it's just visible. Help! I honestly didn't notice it until now.