I don't know why my painting back from apple became like this.

Hello

I suggest you contact Apple Support (mail service may be available) or make a Genius Bar reservation in order to your watch, inspected and repaired (depending on the warranty, if it qualifies):

To check your warranty status (the serial number is on the back of your watch):

Note that, to avoid damage in the long term for your watch, it is important to follow the instructions for cleaning and maintenance of Apple, which include:

Tags: Apple Watch

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