She definitely has had skin lightening and plastic surgery. If I had to guess, and I am no expert, she looks like she has had a nose job, her lips taken in, and some type of jaw reconstruction. Look at those face parts on her before and after pictures. And to back this up further, here is a picture of Michelle Obama 29 years ago to show that she had the same nose shape. She may have had Botox done before, but judging from the two pictures that are 29 years apart.
<img src="http://emptysuit.files.wordpress.com/2011/04/micl.jpg?w=700">
http://emptysuit.wordpress.com/2011/04/19/michelle-obamas-face-liftbleached-skin/
<img src="http://emptysuit.files.wordpress.com/2011/04/micl.jpg?w=700">
http://emptysuit.wordpress.com/2011/04/19/michelle-obamas-face-liftbleached-skin/

