Red screen glow

Hi,

My iPhone 5 screen has a little red glow. It's the most visible when the brightness is on maximum and the screen is white (for example Safari). It is always visible when I use Safari or something with white background, when I run games or something like that it's not visible. I'm not using maximum brightness, just tried once and then I noticed this glow for the first time. It looks like rectangle with rounded corners and it's located 5mm from the edges of screen (this 5mm border looks good).