Hello, I have a question I have found for sale a Cintiq with small, irregular dull spots (not black, gray ) about 2 cm in diameter. The seller says it is due to the pressure with the pen while in use. I wonder if that defect could spread, enlarge. Non for pressure, I will be very delicate using the screen, but I was wondering if it was due to the heat of the screen, and using the screen it will warm up and I fear that the stains could enlarge. Is it possible? It's a real risk? If it is real this heat-problem could affect any kind of monitor, like my iMac, am I right?
Two images to show how are the stain (in two different screens):
Thanks a lot.

(Excuse me, if you think this is not the appropiate section of the forum.)