The earliest description comes from a 16th century British pamphlet, featuring a Welsh widow with a four-inch-long growth protruding out of her forehead. Cutaneous horns were originally regarded as divine punishment, or a spectacle to be paraded around. In more recent decades, doctors have worked to understand the variety of decidedly less supernatural causes. 

Learn more about your ad choices. Visit podcastchoices.com/adchoices