My 4generation itouch screen turned partially white ,why?

_808love

New member
I was holding my itouch regularly , & I got a notification & the screen was fine . & 1 minute later I opened my lock screen again, & it looked like a paper trying to print that was low on color ink.
It was all white on one side , & faded around that. I just don't know why please help me out , thanks !(:
 
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