The Obakemono Project

Futa-kuchi-onna (Two-Mouthed Woman). "...Like the rokuro-kubi, the futa-kuchi-onna is a woman afflicted with a curse or supernatural disease that transforms her into a yōkai. On the back of her head beneath the hair, the woman's skull splits apart, forming lips, teeth, a tongue, until there is an entirely-functional second mouth in that spot. As if that weren't bad enough, the mouth begins the mumble spiteful and threatening things to itself, and demand food. If it is not fed, it will screech obscenely and cause the woman tremendous pain." From The Obakemono Project - Japanese yōkai. Via Incoming Signals.