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From Pathfinder Treasure Vault (Remastered), which isn't enabled.

Choleric Contagion

ITEM 18
Price 4200 gp
Usage held in 2 hands
Bulk L
Category poison

Activate (manipulate)

This vile poison is contagious, causing the victim's skin to secrete the toxin, allowing it to spread to others. While under the effects of choleric contagion, the first time during per round the victim succeeds at an attack roll with an unarmed attack against another creature, the target of the attack is exposed to the poison.

Saving Throw DC 40 Fortitude
Maximum Duration 6 rounds
Stage 1 6d10 poison damage (1 round)
Stage 2 8d10 poison damage (1 round)
Stage 3 10d10 poison damage (1 round)
Pathfinder Treasure Vault (Remastered)ORC