Very strange screen problem (previous app leaves mark)

I'm Danielle, i'm from the Netherlands and i'm having a very strange problem with my iPad mini (bought It August 2013).

never had problems with my iPad, but since a few weeks i have à strange problem with my screen.

when i open an app, for example messages, and i use it for a while, and then return to the home screen or go to another app,the messages app leaves a mark o'n the screen at the left side of my screen (an area of 2 cm from the Side). my english is not very good but im trying to describe it.

I cant make a print screen of iT because its a problem with the screen So you dont see iT on a print screen.

so:

- i see a mark of THE previous screen(app) on my screen

- first i throught iT was: in dutch we call it doorgebrand, translated in english: burn through (dont know if i translated it right). Like a old computer when you are working at a screen for to long so letters and text are printed, permanently, on the Screen (Thats why you have screen savers).

- but: it disapears in a few minutes or if i open a black screen.

- It's not very clear to see (The longer i used the app, The clearer the Mark) and iT has horizontal stripes

i hope someone has experience with this problem or knows what i have to do.

i never heard of this problem before and i cant Find iT on Google.

kind regards,

danielle from the netherlands