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Bring plenty of sneak/inv (spell, meds or nin tools). The Fetid Flesh is in the basement of Garlaige Citadel. Simply come to one of the areas on the main floor that you can "drop" thru - they are on both sides of the large open basement floor.

For exact position please consult - this link will take you directly to the page for Fetid Flesh on the ffxiclopedia database