u/velydry

I recently bought a DSI on vinted, i have some problems with the bottom screen.

Ever since i had it, one of the corners gets a little bit white, then two horizontaly white straights lines appears.

I am scared the bottom screen could become completely white.

Does anyone know what is it and if/how i can repair it ?

Thanks everybody !

(Sorry for any mistake i made, i'm not a native english speaker)