View this YouTube video on SCC in situ and Pigmented Bowen's disease. Click on the arrow and when it starts go to the bottom of the screen and change the 360 resolution to 1080 and then click on the box with the arrows pointing out to enlarge to full screen. These videos are recorded in high definition which makes for great viewing if you have a fast broadband connection. Press ESC on your keyboard to return to normal size.
Click this link to download and read the definitive article on Pigmented Bowen's disease from Alan Cameron and Cliff Rosendahl in JAAD