The incident took place yesterday while the 19-year-old girl and accused Gyan Prakash were waiting for their turns to be examined at the dispensary, a senior police official said.
"While waiting, Gyan started molesting the victim," said the official.
The victim raised the alarm, after which people there beat up Gyan. Later, police was called.
A case has been registered.
"Based on the girl's complaint, police have arrested him and further investigations are on," the official added.