Iphone 5S screen strange looking rainbow colored line when phone is off. This normal?

Okay so I never saw much about this topic because most people who complained about their screens on iPhone had dropped their phones. I just got this phone this morning and have been using it all day. I noticed a sort of pattern on it when the screen is off like a rainbow colored ripple that curves around and goes from the top of the phone to the bottom. It's only visible when the phone's screen is off and at an angle. Just wondering if this is anything to worry about?

Nah. It happens to every device. Mine does it even. It is just the reflection off the digitizer.

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