it's looks like color transfer to me. ive felt it and it doesnt really seems like it's imprinted in the surface. i mean it's 1/8th of an inch, but its on the front and now every time i look at the bag its all i see! i'm sure no one else would notice it unless i mentioned it.
I use a QTip dipped in white vinegar or rubbing alcohol...barely enough to dampen it Maybe spot test with the alcohol. I've never had a problem with vinegar, but the alcohol has taken some of the shine off before. And lightly rub it, they've always come off my Valentino Lacca bags with this method. I would never use a magic eraser though, it would take the shine way down.
I have removed scuffs from patent shoes using nail polish remover (the acetone kind). I put the smallest amount on the end of a q-tip and barely rub it over the scuff, then remove it right away with a soft cloth or paper towel. I haven't had any problems with it, but you might want to test it first if you're using it on a bag.