I have this problem on back panel of my phone to I take care alot from my phone but after few month I removed my phone case (i used silicone case)
I saw some dots and little scratch on backe of my phone
I dont know what cause this problem 😕
It happens, it is the dust particles or debris that circulate within the case, resulting in scratches. Now, you can't do anything.
For future, always make sure to frequently clean the case - in every 2-3 weeks. People always tend to forget to clean the back cover case.