The boy, a UKG student, was taken to a hospital for treatment, they said.
In a complaint, the boy's father said the teacher hit his son with a stick on his back, Osmania University Police Station Inspector V Ashok Reddy said.
Following the complaint, police registered a case under relevant sections of the IPC and the Juvenile Justice (Care and Protection of Children) Act and were questioning the teacher, he said.
The boy was later taken to a hospital, Reddy said.
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