6s Rose gold back panel gets dotted corrosion marks

hello! just buy any cover at apple store! thank you

Hi

If you are concerned about a potential manufacturing defect, contact Apple Support (mail-in service may be available) or make a Genius Bar reservation with a view to having your iPhone checked and, if recommended by Apple, serviced (under warranty, if eligible):

• Contact - Official Apple Support
• https://twitter.com/applesupport
• http://www.apple.com/retail/geniusbar/

To check your warranty status:

https://checkcoverage.apple.com