white patches develop on the metallic body of J7 pro automatically even if u are using protective case. when you observe these patches closely you will notice that these are nothing but the points where colour has been removed..
Thanks for sharing your concern. We would suggest you to visit nearby Samsung Service Centre in order to get your device physically inspected by the service engineer. Please find service centre details in the link provided -http://www.samsung.com/in/support/servicelocation
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