My laptop is HP , windows 11 , AMD Ryzen 5500U. It is 1 year old. From last 2 days I am facing a problem . In the lower right side a black shadow type thing is coming and flickering . But If I increase my brightness it is vanishing . If my brightness level is below 30 The black shadow is quite prominent and it’s flickering quite fast . what could be the reason and potential solution for this ?

I tried restarting and cleaned the area but nothing happened.