Spitz nevus, or Spitz nevi, is a rare, noncancerous skin growth that typically impacts people under 35 years old. It often presents as rapidly growing moles and is common on the head, face, and legs.

Nevus (plural: nevi) is the medical term for a mole. Nevi are very common. Most people have between 10 and 40. Common nevi are harmless collections of colored cells. They typically appear as small ...