A cutaneous horn is a type of growth that appears on the skin. It’s made of keratin, a protein that makes up the top layer of the skin. It may look like a cone or horn and can vary in size. The growth ...

What Is a Cutaneous Horn? A cutaneous horn is a funnel-shaped growth that grows from a red base on the skin and is made of compacted keratin, the same protein in nails. It's shaped like an animal horn ...