Cloak of Poison 
Feat 13LeshyPoisonSource Ancestry Guide pg. 43PFS Note “An unarmed attack or melee weapon without the reach trait” refers to all unarmed attacks (whether they have the reach trait or not), as well as melee weapons without the reach trait.
Frequency once per day
You secrete a cloak of concentrated poison that harms any who dare attack you. For 1 minute, any creature that touches you or damages you with an unarmed attack or melee weapon without the
reach trait takes 3d6 poison damage.
Traits
Leshy: Leshies are living plants animated by primal magic.
Poison: An effect with this trait delivers a poison or deals poison damage. An item with this trait is poisonous and might cause an affliction.