BETHEL, Conn. (NBC) -
In the bustling hallways of Bethel Middle School, kids are rubbing erasers up and down their arms and it's causing a stir.
It's called the ABC eraser challenge. Kids rub erasers on their arms while saying the alphabet.
"They’re coming up with words in between: ‘A’ apple, ‘B’ boy and so forth all the way to ‘Z’ and then at the end they show their friends: what does it look like, how far did they go. How big is the mark?” said Principal Derek Muharem.
Murahem says about a dozen boys and girls have been seen by the nurse for injuries from the challenge.
“They're using erasers, and they're breaking the skin, sharing erasers with a friend. And then who know what's out there, blood on the eraser, you can get an infection that way,” he said.
It was enough of a red flag that he emailed parents about the incidents.
"I’m very glad the school makes us aware of things but on the other hand they have to edit what they're telling us and what the kids are actually hearing. Because the kids are getting emails just like the parents are obviously," Elisa Volpati, who has a son at Bethel, said. She's concerned, but knows that it's a part of growing up.
Counselor Amanda Kirk agrees, saying the eraser challenge is another example of adolescents pushing the envelope.
"It is developmentally appropriate for teens to try things, experiment and maybe take some risks which is why is so important for parents to be aware and to look for these things,” she said.