Mac book - what’s caused this, does anyone know?

[Ohhelp2345]

Brightness in bottom left corner . I can only see it when the screens black . I’m a bit panicked as it’s not even a year old . It’s not been dropped at all and zero exposure to liquid . Bit panicked as I can’t afford a new one (though that might be a bit dramatic!)

could be a minor fault. Is screen working fine otherwise?

I have this on mine. Not really thought about it. I has been dropped a couple of times but it works fine so I'm not concerned.

If it's not a year old, isn't it still under warranty?

Yup if it's new it's still under warranty but don't hang around get it sorted ASAP. Apple Stores can have amazing customer service but not all of them.