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I feel so bad for my phone by SONY XPERIA XP (F8132),I only used 5 months (16W23)and find mura in touch panel under white pattern.How to control your quality,SONY team member???Even I can get free replacement in your service center in Taiwan Taipei but nobody tell me WHAT THING HAPPEN?? I am your fan,I bought many SONY TVs and mobile phones in my house,how can you treat me that.....??
if you still have warranty and if this can be proven a manufacturers defect, I suggest to talk about this to your retailer and your local service Local support
Hello @SONYstrong,
I'm really sorry to hear about your Xperia X Performance. 
Do you mean that you are able to see a spot on the display with a white background showing? Is this also visible if you test the display in Diagnostics? This test is otherwise found under Settings > About phone > Diagostics > Test > Display. If it can be seen here as well my guess is that this is related to hardware rather than software. In that case I can only refer you to have your device sent for repairs at one of our authorized service centres, something that I recommend you contact your Local support about since warranty and service procedures vary on a local level.
Please let me know how it goes!
I'm sorry to hear that. There is unfortunately not much I can do regarding this on my end as I am situated in another market than you are in. For further information about your case I can only refer you to your Local support.
Even if you send me the invoice I will be unable to follow it up, I'm sorry for the trouble that this might cause for you. Please let me know if there is anything else I can assist you with.