Random red pixel appeared on a 2 year old monitor?

[Benc12]

So when i turned my PC on ealirer today i noticed that there a tiny small dot close to the middle of my screen. Its only just appeared as i notice these little things straight away. ive looked and people seem to say the red dot represents a dead pixel? If this is the case why has this happened all of a sudden over night? and if i was to leave it would it become a bigger issue? its on my second monitor so i can definitely live with it as its just for browsing etc.

 

[cwli1_]

Stuck pixel. Rub & wait a few days.