Grey Spot on The Top Right of The Screen
iPod touch, iOS 6.1.6
iPod touch, iOS 6.1.6
The screen has to be replaced
If not covered by warranty
Apple will exchange your iPod for a refurbished one for $99. They do not fix yours.
A third-party place like the following maybe less. Google for more.
iPhone Repair, Service & Parts: iPod Touch, iPad, MacBook Pro Screens
Replace the screen yourself if you are up to it
Grey Spot on The Top Right of The Screen