The injuries to the freshman girls were not-life threatening, county schools spokesman John White said. Classes remain in session, and no other students were involved in the fight.
Both girls are being treated at a hospital, White said.
A Prince George's County Sheriff's Office deputy based at the school charged two 13-year-old girls in the connection with the incident, according to Prince George's County police. The girl with the razor was charged with assault and disruption of school activities. The other girl was charged with first- and second-degree assault.
Authorities believe the razor was a box cutter, White said. Razors are banned in school buildings, and such an incident could lead to expulsion.
School officials will send a letter home to parents about the incident, asking them to talk with their children about any tensions that could lead to conflicts.