The Lumps Antidote for the Lumps appeared in the episode Trouble in Lumpy Space, when Jake (and later Finn) is afflicted with the Lumps. Finn spends the episode trying to find the antidote to save Jake, and ends up finding it at Makeout Point, being kept by Lenny, Monty, and Glasses, where the trio spends all of their time taking turns sitting on the antidote.
The antidote works on anyone who sits on it, but the affects are only temporary for anyone who has the Lumps past midnight. The Lumps is only caused if a lumpy space person bites a victim (accidently or purposely) and causes the person to turn lumpy. Same effects as Werewolf rules.
The antidote is a large white ball similar to a pearl.