I have not had this problem . . . . but I will bet someone tells you it must be fake! =) Anyway, just take it back to NM and they will take care of it for you. Probably with a new bag.
I took the bag back to NM and they will send it back to Prada (4 weeks) to re-coat it. The SA says that she had never seen this happen to a Prada but she did see it happen to Marc Jacob and other metallic coated leather bags.
Hi! My miumiu caught something sticky so I went back to Saks to ask what to do. The SA recommended me a shoe repair shop to buff the leather. I'm wondering to take it to shoerepair or go to NM? How much does the cleaning cost? --Thanks~