Police are investigating allegations of violence after an incident at Club Royals in Manukau.

A transgender woman claims she was left with a black eye and a split lip after being assaulted by bouncers at a nightclub.

However, the club is disputing the allegations, saying the woman fell down the stairs while being removed from the premises for aggressive behaviour.

The incident took place about 1.25am on July 3 at Club Royals, a Samoan nightclub in Manukau, south Auckland.

In a public post on Facebook just after 3am, Falencie Filipo shared a photo of herself lying in a hospital bed with cuts to her face.

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"Club Royals is the worst place to go to if your a t girl yeah this is how they will treat you no care in the world [sic]," she wrote.

'T girl' is slang for a transgender woman.

The post has been shared more than 1100 times.

In a later post, she wrote: "When does it get better? How many hate crimes must we endure? How many lives must we lose? I can only do so much for my community so I ask....WHEN?"

However, the club's duty manager Fano Pele said Filipo had been warned "several times" about "inappropriate behaviour" on the night in question.

When bouncers approached Filipo, she became aggressive, Pele said.

"She struck at a customer, which is totally unacceptable, which is why security had to do their jobs to escort her off site. As they were escorting her off site, she was resistant - she refused to get moved."

Pele rejected claims the bouncers had assaulted Filipo and said the woman had fallen down the stairs.

"I'm assuming that's where she got the cuts."

A police spokeswoman confirmed the incident was under investigation.

"Police were called to the address at around 1.25am after reports of disorder."

"Police have received conflicting reports as to what has happened at the bar prior to and at the time of the reported disorder, including allegations of offending by both Falencie Filipo and bar staff," she said.

"We cannot make any further comment at this stage."