Dumbledore's Army parchment jinx

Form on his or her face across the cheeks and nose, forming the word "SNEAK."

When Marietta Edgecombe betrayed the trick," arguing that Hermione should have at least told everyone that she had jinxed the parchment, but Harry Potter retorted that he thought it was a "brilliant idea." This was the row that triggered the end of their romance. Marietta had the marks even the following year, counter-jinx could not be found or that Hermione refused to give it to Marietta. The boils did fade with time, but left scars.

Behind the scenes

 * The jinx may be related to the Furnunculus hex, which causercion will not trigger it. However, the jinx was not mentioned at all in the film adaptation.

Appearances

 * Harry Potter and the Order of the Phoenix