A Swedish teen has been punched and glassed in the face by a man who groped her at a nightclub.

Sophie Johansson left Bebel nightclub in Malmo, Sweden, drenched in blood after a man she had never met before struck her in the left side of the head with a glass bottle on Saturday.

The 19-year-old said her attacker violently lashed out, also punching her with a closed fist, after he made an unwanted advance and she pushed him away.

"I turned around and then I felt his hand on my bottom and between my legs," she told Aftonbladet .

WARNING: GRAPHIC CONTENT

Ms Johansson said she went into "shock" as the man fled the scene. No arrests have been made.

"I thought it was liquid from the bottle [on my face], but then my friend said there was blood pouring down," she told the Swedish paper.

She left the club covered in blood after an unknown man allegedly struck her in the left side of the face with a glass. (Aftonbladet)

The young woman was rushed to a nearby hospital where several cuts on her face were treated.

A police report was filed, however officers said the investigation stalled due to a lack of evidence.

"We hope that someone has seen something, seen the incident. If so, we will open up the investigation again, " Malmo police spokesperson Nils Norling told Aftonbladet.

The nightclub, which was bombed in November, issued a statement urging witnesses to come forward after a patron was "beaten by an unknown man".

"We have no tolerance against violence, threats and all forms of abuse. We and our staff work closely with police to supress and prosecute all crimes," the club posted to Facebook yesterday.

Malmo said it turned over all relevant evidence to the police and asked their patrons do the same.