Beautiful Ruby Red Party Dress size 0 one shoulder

Beautiful Ruby Red Party Bodycon Prom Dance Dress size 0 one Single shoulder, knee length with ruffle down the back right side. So stunning! Perfect for prom. Pictures don't do justice to this dress. It runs big. Fits like a size 2/4. I found a small mark on the back near the hem. See picture. I have not tried to get it out.