Binding of Isaac: Rebirth Wiki
Binding of Isaac: Rebirth Wiki

Bob's Rotten Head is an activated item.


  • Upon use, Isaac holds a poison bomb which can be thrown in the cardinal directions and explodes on impact.
    • Removed in Repentance The explosion deals a flat 50 + Isaac's tear damage and poisons affected enemies.
    • Removed in Afterbirth The poison deals 6 or 8 points of damage over time.
    • Added in Afterbirth / Removed in Repentance The poison deals 3 times Isaac's tear damage over time.
    • Added in Repentance The explosion deals a flat 185 + Isaac's tear damage and leaves behind a gas cloud that poisons affected enemies. The poison cloud deals 5 damage.
    • Added in Repentance It will now bounce off walls slightly before exploding on the floor, whereas in previous versions of the game it would explode on contact with the walls.
  • Added in Afterbirth This item belongs to the Bob set. Collecting three items from this set will transform Isaac into Bob.


  • This item can drop from Sloth.
  • Bob's Rotten Head is affected by many tear modifiers and some bomb modifiers. Notable exceptions and precautions are listed below.
  • Bob's Rotten Head cannot directly impact Beggars, Slot Machines, or Blood Donation Machines, just passing through, but can destroy them with the blast damage if it impacts anything nearby and open Secret Rooms, Super Secret Rooms, or destroy rocks like any other bomb.


In-game Footage[]

Unlockable Achievements[]



  • The item's appearance is similar to Pestilence's head.


PC Normal mode only 6DKD WJZG (Treasure Room adjacent to spawn)

PC Normal mode only A7ZJ BFRD (Treasure Room adjacent to spawn)

Vita Y8JW A17S


Bug Bug! Although Bob's Rotten Head works normally with Butt Bombs and Bomber Boy has no effect, their combination drops the explosion damage by 50%.
Bug Bug! Using Bob's Rotten Head with Trisagion leads to an instant explosion that hurts the player.

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