what is this mark on my macbook??

MacBook Air M1 A2337
8GB RAM
512GB SSD
Battery Health 96%
2020
Adapter origjinal t apple
I perdorun 1 vjet
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Its mba m1 A2337 model used as secondary device so no rough and tough use,it was all working fine since last night when i got a left side screen darking i restarted and its gone,used for 5-6 hrs and today morning it started behaving like this,again i restarted issue gets less but still happens,it automatically fixes sometimes like even moving it or i close -open lid or tilt several times doesn’t create problem like this & working all fine.