Smudger

Smudger is a term used in the Harry Potter series by J.K. Rowling to describe a magical creature that can leave a smudge on a person's skin when they are touched. The smudge is a dark mark that appears on the skin and is said to be a sign of the person's magical abilities. Smudgers are often used in magical communities to test for magical abilities, as they are one of the few creatures that can leave a smudge on a person's skin. The smudge is said to be a permanent mark, and it is believed to be a way for the magical community to identify those who are capable of performing magic. Smudgers are not typically dangerous, but they can be unpleasant to be touched by, as the smudge can be painful and itchy. In the Harry Potter series, Smudgers are used by the Ministry of Magic to test for magical abilities, and they are also used by the Hogwarts School of Witchcraft and Wizardry to test for magical abilities among their students.