What could be causing the pink tone (streaks) to appear on a Dell monitor?

Question

Monitors

Good evening
It all started with the fact that a white dot appeared on the top right of the monitor (something similar to a luminous diode), and today this pink tone came out, what could be the reason? this is almost invisible on color images, only objects are repainted in pinkish :c
Monitor 23 "Dell U2312HM

Answer 1

Right here - Because of what remains a "trace" on the monitor?
They changed the entire monitor under the Dell warranty. This is a matrix.