Question: my dog has a zit on his lip?
Answer: What is papilloma virus? Canine oral papillomas, also known as oral warts, are small, benign tumors of the mouth caused by the papilloma virus. They are found on the lips, gums, mouth, and rarely can also be located on other mucous membranes. Canine oral papillomas usually affect young dogs, under the age of 2.