http://www.break.com/index/horrible-...into-tree.html
They appear to be Cutaneous Horns..
My personal theory is he had the mutation neccasary for their growth but it wasn't till he caught Leprosy that his genes kicked in.
Looks like the same guy
http://www.markallencam.com/EasternE...Condition1.jpg
http://blog.wfmu.org/freeform/2007/0...nary_enco.html
And they appear treatable. Though to what level you can judge..
http://www.markallencam.com/EasternE...Condition7.jpg
http://www.markallencam.com/EasternE...Condition8.jpg
A couple more less extreme but FUCKING COOL ones..
http://www.democraticunderground.com...ress=228x30335
http://www.ananova.com/images/web/982715.jpg
http://www.messybeast.com/horned-cats.html