Why do I have a gray spot on my screen?

[Awkward Mate]

Hello! I have the Samsung Galaxy J5 (2017) and yesterday morning, I woke up to a gray circle on my phone. It got a little bit bigger since. It's not captured on a screenshot. I was wondering, is this a burn in/stuck pixels? And is it covered by warranty?

 

[B. Diddy]

Welcome to Android Central! If it's not in screenshots, then it's a screen defect. As long as you haven't dropped the phone or exposed it to water, it ought to be covered by warranty (if the phone is still under warranty).