Putrid Cyst

What drops it

 * Level 20 Afflicted

Festival collectors

 * You could exchange these for various party, alcohol, and sugar items during the Farewell to Gaile event in 2008.

Shenzun Tunnels

 * Enter Shenzun Tunnels from Sunjiang District (location) and follow the map. Clear the area south of Sunjiang District first, then the northwest and finish in the south-west.

Seafarer's Rest

 * Leave from Seafarer's Rest into Rhea's Crater. 20 Afflicted 1 minute south yields about 1 Putrid Cyst every 5 minutes for a party with 2 hench.