A benign viral infection caused by a virus of the family "Poxviridae", Genus "Parapoxvirus". It affects the skin of the teats with vesiculopustular lesions, which rupture in about 48 hours, forming thick scabs resembling prominent buttons. After a few days, the scab detaches, leaving a granulomatous lesion that can persist for several weeks. The lesions are minimally painful.
Within a few weeks, they can affect several animals, especially in situations of poor hygiene during the milking routine.
It can also cause lesions on the hands of milkers: "Milker's nodules."
