Yikes! I've noticed the lower left corner of my M1 Macbook Pro 13" is brighter than it should be - I only noticed it when watching a movie and what should have

Yikes! I've noticed the lower left corner of my M1 Macbook Pro 13" is brighter than it should be - I only noticed it when watching a movie and what should have been black, wasn't. I'm not looking forward to that getting worse.