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Milker's Nodule

Milker’s nodule is a focal skin lesion caused by paravaccinia virus, a parapoxvirus that causes udder lesions in cows. The lesion passes through 6 stages; this image shows the stage in which a single red edematous papule develops from an initial macule.

Image courtesy of the National Institute for Occupational Safety and Health’s Occupational Dermatoses web site (www.cdc. gov/niosh/ocderm.html).