Thames Valley Police is appealing for witnesses to an assault in Bletchley.
The incident happened at Bletchley railway station, in Sherwood Drive, at 3.20pm on Monday.
The victim, a 19-year-old woman, was walking up the steps to the railway station with a friend when she walked past a man and a woman who were sitting down.
The man said something which the victim did not hear and when she asked him to repeat it he became verbally aggressive. He then punched the victim in the face at least three times.
A scuffle then broke out during which the victim dragged the offender on to the ground.
The victim suffered a small gash to her right eye which was bleeding heavily and needed hospital treatment.
PC Hannah Bailey, who is investigating the incident, said: “I am sure that there would have been other people in the area when this incident happened and I urge them to come forward as they may have information that could help us progress our investigation.”
The offender is white, in his late teens to early twenties, 6ft, with short brown hair, a muscular build and brown eyes. He was wearing a black polo shirt and black combat trousers and was carrying a black rucksack. He was with a woman who is white, in her late teens, with long brown hair and a slim build.
Anyone with any information about this incident should contact PC Bailey via the force enquiry centre on 101.
If you don’t want to speak directly to the police you can contact the independent charity Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org.