Milk pox is a medical condition that is sometimes known by other names, including cowpox or vaccinia. The condition is caused by a virus that is similar to smallpox and can be transmitted to humans who come into contact with infected cows or other animals. Symptoms of milk pox include fever, headache, and a pustular rash that may appear on the face, hands, or other parts of the body. Although the condition can be uncomfortable, it is usually not serious and typically goes away on its own within a few weeks. Treatment may include antiviral medications and supportive care to manage symptoms.