Light thing appear on Macbook Pro retina

Why this light thing appear in my Macbook Pro retina bottom screen everytime i put on sleep mode? btw, i'm new Macbook user

This is an old support article addressing your problem.
http://support.apple.com/en-al/TS1258
If the CONTROL+SHIFT+EJECT does no rid the MBP of this phenomenon, make an appointment at an Apple store genius bar.  Bring the picture with you just in case the MBP starts to behave in front of the technicians.
Ciao.

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