These benign but bothersome tumors are as individual as the array of potential treatments

They’re the most common type of skin tumor in horses, and they’re usually not all that alarming—but although they’re categorized as benign, sarcoids have plenty of troublesome potential.

The thing about sarcoids is, they’re devilishly difficult to defeat. Although they seem to have a common cause—a virus called bovine papilloma, which causes warts in cows—they are masters of disguise, taking any number of different forms and casually defying any kind of easy cure.