Pimple Jinx

Furnunculus is a Dark Spell that causes a person to break out in boils when it comes in contact with their skin. This spells effect can be cleared by Boil-Cure Potion.

Uses

 * In 1994, Harry Potter tried to use this spell on Draco Malfoy. but it was deflected and hit Gregory Goyle in the face. He later used it on Vincent Crabbe, which, when combined with George Weasley's Jelly-Legs Jinx, caused Crabbe to sprout little tentacles on his face.
 * In 1992, Fred and George Weasley probably used this spell on themselves when they tried to cheer up Ginny Weasley by covering themselves in boils and jumping out at her.
 * An Obliviator named Arnold Peasegood was probably hit by this spell while attempting to break up a Goblin Riot in Chipping, Clodbury.
 * It is possible that this was used by Morfin Gaunt on Tom Riddle Sr.

Etymology
Furuncle is another term for a boil, derived from the Latin word furunculus, which means "petty thief".

Behind the scenes

 * This hex may have inspired the jinx Hermione Granger placed on the parchment signed by members of Dumbledore's Army. It was designed so that if any member betrayed the group, boils spelling "SNEAK" would break out on the person's face, which is what happened to Marietta Edgecombe.

Appearances

 * Harry Potter and the Chamber of Secrets
 * Harry Potter and the Goblet of Fire

Furnunculus