If the trademark of the Dior scarf you purchased has fallen off, it is recommended that you take the following measures:

1. If you purchased it in a store, you can go to the store with the purchase voucher. Report the problem to store staff and request a replacement or return.

2. If you purchased an authentic Dior scarf and the scarf trademark falls off, you can choose to contact Dior customer service or brand authorized dealers to report the problem to them and ask whether Provide you with after-sales service.

3. If you cannot contact the brand customer service or authorized dealer, you can also choose to find a professional clothing repair shop and let them help you sew the trademark back on.