My initial guess would be a papilloma... however, I don't think I've seen one quite like that (doesn't mean it's not one). If it is a papilloma, by time you see it, it's no longer contagious... and it should resolve all on its own!
Murdock, BH - GSD
Virgil, CGC - GSD
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Tara, Reagan, Madison, and Jefferson - Aussies