Enlarge / Horns like these, but on a man’s back. (credit: Image Engine)

Smartphones won’t make you grow horns—but neglecting a worsening skin cancer lesion for years could do the trick.

Recently, doctors in the UK surgically removed a 14cm-long “dragon horn” from a man’s lower back. The 50-year-old patient reported that it had been growing for at least three years.

The doctors determined that the “gigantic” skin growth was a cutaneous squamous cell carcinoma (cSCC)—a type of skin cancer that causes growing, scaly bumps on the top layer of skin.