The blue pressure on the screen is causes by uneven LOCA Liquid Glue. If it is not spread out evenly this occurs.
Those are pressure marks just to be clear.
Check if there is anything under the screen between metal back frame of screen and loudspeaker / earpiece speaker.
Also check the back of the screen on the black part for any dust / dirt / glass).
Those are both magnetic with speaker filters and can gather dust or lint on.
Also if the frame is dented in a way that doesn't let the screen sit flush to the frame properly it can cause that too. In that case the metal housing frame needs to be bent back in place.
Another reason is the battery being bloated putting pressure under the screen but this is uncommon.
Other than that you can't really do much about it and most likely need to put another screen in result.