The woman told police she was attacked around 11pm on Saturday night when she got off a bus in central Landskrona, the local Helsingborgs Dagbladet newspaper reported.
Two men suddenly appeared and threw the woman to the ground.
One then held her down while the other took out a knife and carved “hora”, the Swedish word for “whore” into her arm.
The woman, who was also reportedly cut in the face, was later taken to hospital by relatives.
Local police confirmed the incident for the newspaper, but refused to divulge many details about the circumstances of the attack.
“We have quite a bit to go on and we’re doing our best to solve it,” a police spokesperson told Helsingborgs Dagbladet.
The incident has been classified as a case of particularly aggravated assault.
Police spent Sunday investigating the incident, but have yet to make any arrests for the suspected knife attack.