I don't think they are, bendy. They seem to be a misfunction of the cell, causing it to differentiate as inappropriate tissue, but I'm not sure they know why it happens
But you're right--that does resemble some papillomas I've seen pics of.
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."