One red dot appearing in right side of screen in Xperia z

I am using Xperia Z, a Very small red dot appearing in right side of screen that displays only in black background
Please help..

What thommo meant is it's ( stuck pixel) a pixel that fails to show any other colour than what it's showing you ( red here )
A dead pixel is dead and it doesn't show any colour.
Upto 4 stuck / dead pixels are considered normal but above that it is considered as hardware defect.
In that case you could claim for warranty and have the device repaired or replaced free of cost.
 

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