Dead pixels look like black dots and don't light up, but sometimes they disappear on their own. Free apps like JScreenFix can try to fix stuck pixels, but they're unlikely to fix dead pixels.

A defective pixel on an LCD screen. Bad pixels are often transistors that are permanently dead and appear as black dots or permanently energized and show up as white or colored dots ("hot pixels").

Nintendo says dead pixels on the Switch are normal. Since the Nintendo Switch launched, there have been reports of hardware issues and defects relating to the Joy-Cons, the the design of the dock, and ...