Flea Circus is an unlockable trinket in Fiend Folio, a mod for The Binding of Isaac.

When an enemy dies, there's a 20% chance that they will spawn one of the following Skuzzes:
• Flea of Meltdown
• Flea of Deluge
• Flea of Pollution
• Flea of Propaganda.

Have all other 4 flea trinkets unlocked.

Flea Circus can be found in the following item pools:

The following special synergies and interactions for Flea Circus have been documented.

* Note that not all possible synergies and interactions are listed here.

• Check out the trinket description on the mod's external Wiki.
• Download Fiend Folio from the Steam Workshop.