Chosen Solution
I replaced the battery in my 5s. I thought all went well. All features worked when reassembled including touch id. However, a faint shadow appears on screen when home button is depressed and when I press down on the lower right corner of the phone. I reopened the phone to make sure nothing was sticking up and getting in the way of closing it. Nothing was. Could I have bent the LCD or something else when snapping it back together or what else could cause this? Any ideas for a fix? MANY THANKS……….
This is most likely caused by the replacement battery. Of it is sticking up too much, even as little as 1mm, then when you apply pressure via the Home Button or the screen itself, you will see darkish forms appear. Open up the phone and insure the the battery is completely flat and not leaning against anything which would cause it to be lifted up.