@charlesfosoh sounds to me like you are referring to the display. If so, it is time to replace it. since iFixit does not yet have a specific guide for that, use something like [https://www.youtube.com/watch?v=wMdhMQwadNI|this video] Replacement displays are readily available at many online stores.
While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.
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