@itsabssam you are not telling us if they did just all of a sudden appeared or if something happened to your phone. The most common issue would be a broken display. I would start with replacing it. Use something [https://www.youtube.com/watch?v=L0TQu9937_A|like this] video for the repair. New displays are readily available. Just do an online search and select a vendor of your choice.
If a new screen should not fix this, you will need to check the LCD connector on the board as well as the board itself for missing components etc.