Looked it up, it's called Cutaneous horns. It's a skin tumour, rough and wooden or horn like. They don't usually get as bad as the guy who will be in next weeks episode...
http://www.telegraph.co.uk/news/main.jhtml...12/wtree112.xml
Interesting and really freakish. Thought you guys might like to see! I'ce never heard of or seen anything like it!

The show is on next Wednesday at 9pm on Five. (UK)