Stain on screen

Dear apple support,

I have a concern regarding my MacBook pro. I bought this last October 2015 and since 2017 i got this staingate in my screen. i though it is just a ordinary stain that i can easily remove by cleaning. But its getting worsed. Can you please help me to solve my problem or i heard that there is warranty for this kind of problem.

I hope you will responce my concern as soon as possible.

Regards,

Julie

[Re-Titled by Host]