An interesting video on acanthosis nigricans.
http://www.youtube.com/watch?v=rosQtcBEibk

"Acanthosis nigricans (AN) is a marker on the skin found on children or adults at risk for having or developing type 2 diabetes. There is considerable confusion about what it means to have AN as well as how it should be best managed. This short video explains AN using simple terms and visual images and answers common questions about how it is best treated."