A pupil from The Chase, in Malvern, needed hospital treatment after she was assaulted near the school.
The girl was allegedly attacked by a former pupil on Geraldine Road at around 4pm on Monday. Two others people were involved.
On Wednesday, headteacher Kevin Peck said the pupil was out of hospital and back at school.
"The police are investigating the matter and I'm conducting inquiries myself and will be taking appropriate action in due course," he said.
Police are appealing for witnesses. Call 08457 444888 quoting 162C/190905.
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