title: iPhone Screen Press Detection
body: <p>I am trying to build an app that detects if a user puts their lips on the screen.  How could I get an image of their lips when they put it on the screen?</p>
  
  <p>I know how to detect finger touches, would it be similar to that?</p>
  
  <p><strong>Edit:  Also, wondering about doing this for Android.</strong></p>