Recently my Aunt bought a MacBook Air, but recently her grandsons played with it and after she checked it out, there was this white things that showed up, I thinks the LCD got messed up,

As shown in the picture, the three pics in the left(the black screen is because I took the picture at a dark room w/o a flash, im referring to the white thingies that are shown) are what I've took a picture on in different angles and the picture at the right shows where those white thingies appear

My questions are:
1. Is replacing its LCD screen the only way to fix it?
2. Where can we send it to be fixed?
3. How much will it cost us?

Thank you guys so much for your time