Why there is a off coloured pixel in my display?

[AC Question]

I've been using redmi note4 & few days back i noticed a very small horizontal line which lights oddly in my display, this is visible only in black background. Is this a dead spot or some other damage, please help ?

 

[B. Diddy]

Welcome to Android Central! It's likely a dead pixel, or a group of them. If it's bothersome to you, check with Xiaomi to see what their dead pixel policy is. Most manufacturers won't do anything unless you have above a certain number of dead pixels.