Finding another funny tree

I don't know if there is a sickness that affect trees but I found a tree that have a knob on his trunk.  This one look like being a nose:

I couldn't excape the idea of a mugshot.  So, I snap a photo in front and one from the side of the tree.  I wonder how this knob is made.  Doesn't seems to be an old cutted branch.  If it was a tree sickness, I wonder if there is a vaccine that can be administred to the tree.  Looking at it, I can see an alien-related joke that can come out of the tree.