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From Pathfinder Adventure: The Slithering, which isn't enabled.

Flaying Knife

ITEM 8
Price 480 gp
Usage held in 1 hand
Bulk 1
Category simple
Group knife
Damage 1d4 piercing

This long, thin +1 striking Wounding dagger has a smooth edge on one side and a serrated edge on the other.

Its persistent bleed damage comes from slicing away long strips of the target's flesh, and it deals 1d8 bleed on a hit instead of 1d6. A creature takes a -2 status penalty to saving throws against diseases for as long as it has persistent bleed damage from this knife.

Pathfinder Adventure: The SlitheringOGL