No, yes, you have to replace the screen.
Pixels go bad usually just go dark It's not unusual to have several bad on a new laptop.
Manfacturers will warranty only if so many per sq inch are bad.
I't would look a lot better if you could just turn it off. Sorry I've never heard of how to do that.
Hmm, maybe a microscopic dot of flat black paint??
Or the OP could try a tiny bit of clear transparent tape (Scotch tape) over the offending pixel, and then use a black marker fine-point pen to try to black it out, which would probably be less harsh on the antiglare surface than paint. If not satisfactory, gently peel off the tape..