Also from Scotland, the Bubotuber looks like a giant black slug. When squeezed, it releases gas-scented yellow pus. The pus treats acne, but must be diluted before it is safe. Undiluted Bubotuber pus causes rashes and burns on contact. Muggles classify the pus as corrosive, although none of them are aware of where it comes from.

To grow Bubotuber, one must plant a bulb in dark, nutrient rich soil. Bubotuber requires very little sunlight, and can stand very cold weather. Dragon dung is recommended for fertilizer, and lots of it!

To dilute the pus, either mix with Dittany in liquid form or Gillywater. The pus is also able to lose its scent over time, so be wary when opening mail.