That deer actually has Deer Warts,which are actually fairly common and caused by a virus. They can't be spread to humans but are spread from deer to deer through contact. I had a few trail cam pictures of a doe with one large wart on her face, during the winter it froze off and then the next summer it grew back again. I had a chance to take her that fall bowhunting but unfortunately shot over her back. Her are a few pictures of a deer taken in Rhinelander Wisconsin area with deer warts, kind of gross.
http://wideerhunters.org/images/deertumors1.jpg
http://wideerhunters.org/images/deertumors2.jpg
Paul