Deer Warts

This is a fibroma.

click on the wart to enlarge

Specifically, a type of skin tumor.known as a papilloma, fibroma, or papillofibroma depending upon the predominate type of tissue making up the tumor.

According to Wisconsin's DNR these fibromas are:  firm, nodular, fleshy masses attached to the skin. They are commonly described as warts. Fibromas vary in size from less than one inch to more than four inches in diameter, and they can be found anywhere on the deer's body, but are most common on the face, neck and forelegs. Fibromas are caused by a virus which is transmitted by insects. Infected deer usually mount an immune response, and the fibromas eventually disappear. Occasionally, a deer will be severely infected with multiple fibromas which interfere with the eyes or normal use of the legs, causing health problems for the deer. Fibromas cause no damage to the meat, which is safe to consume.

Either way you slice it (pun intended) they still look gross.