A girl was burned in Prince William County while playing what is described on the Internet as the “salt and ice game,” the county police said.

They said the burns on the 9-year-old’s arm were spotted while she was at school Monday.

According to police, on Feb. 26, the girl and her babysitter were playing the game, in which salt and ice are briefly placed on bare skin.

According to Internet sites, the potentially dangerous activity involves participants competing to see who can withstand the burning pain the longest.

As road crews demonstrate, salt melts ice by lowering the mixture’s freezing point. News accounts report that the melting helps remove heat from the skin, causing burns.

Police said Friday that the babysitter, Keedra L. Smalls, 21, of Dumfries, was charged with child abuse.