Diprosopus

Rarity: Common

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What Wikipedia says

Diprosopus (Greek: διπρόσωπος, "two-faced", from δι-, di-, "two" and πρόσωπον, prósopon [neuter], "face", "person"; with Latin ending), also known as craniofacial duplication (cranio- from Greek κρανίον, "skull", the other parts Latin), is an extremely rare congenital disorder whereby parts (accessories) or all of the face are duplicated on the head.

Excerpt from the Wikipedia article “Diprosopus”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Olli Niemitalo, CC0, via Wikimedia Commons.