Never worn wide dark berry color over the knee boots with heel

Laetitia Heeled Boot - Wide / Size 8 Burgundy color Zipper closure Bought years ago. No longer available online. Never worn. No longer fit after pregnancies. They have been sitting in my closet but when I took them out to photograph I noticed a little dark spot on the side (see photo). I did not try cleaning it. Love these so much! So cute Please feel free to ask any questions. Perfect for fall and winter!