How can I repair my screen?

How can I repair my screen? I have this refurbished monitor and it worked just fine. My friend grabbed the top of it quit aggressively and ever since, you’ll see these ‘black ink splashes’. Is it possible for me to fix it? I really don’t want to buy another. This one is perfect! It’s a Iiyama X2481HS-B1 24 Inch ProLite. I will add a photo of the problem.