xperia miro screen problem

[vasovrk]

hi there!i have this screen problem with xperia miro, every time i press a button of qwerty keyboard it leaves a mark on screen this happens to all applications and generally every background but its more visible in white background ,also the same mark appears when i use the drop down bar and all that aren't visible in screen shot so i had to take a picture with a camera. the problem didn't work out with just an update! if anyone has the same problem or has any idea what is wrong with it please help! thank you in advance!

[Samuel1]

I can hardly see anything on these pictures, possibly a small white "box" on the first pic. But if there's something wrong with the screen you should send it in to a service center so they can take a look at it.