Another woman has come forward saying she was attacked at a Katy Perry concert - this time in Auckland.

Hair-pulling, nail-scratching, fist-throwing girl fights erupted at both of the California Gurls singer's New Zealand concerts, with high heels used as weapons in one mosh pit.

As surges of screaming fans violently shoved to get closer to the pop icon at her Auckland gig on Sunday night, one injured Christchurch woman had to be hauled from the crowd by security.

Canterbury University student Megan Lynch, 21, still has scratch marks and bruising from the concert.

She said she had wanted to ''make the most of the concert'' by getting as close to the front as possible, but was shocked when Perry's appearance sparked a fist fight.

Lynch said a group of seven teenage girls began shoving her and when she told them to stop one of the girls punched her in the face.

''It was a 17-year-old girl punch so it really wasn't that powerful but then another girl started pulling my hair and then someone else started kicking me in the shins and scratching me,'' she said.

Lynch put her hands up to get the attention of a security guard who dragged her from the mosh pit.

She was treated by St John paramedics before going back into the concert to watch Perry from a distance.

''It was really awful, I was shocked by it. It's just so unfair that you can be treated like this when you just want to have fun,'' she said.

''I think it is just the youngness of them, similar to [Justin] Bieber fever, they are just so young they can't deal with being so close to their idol,'' she said.

Lynch was not surprised to hear that a similar brawl occurred at Perry's Wellington gig on Tuesday.

One person was hospitalised and several others were treated for cuts and minor injuries after a scuffle at the front of the crowd.

A St John spokeswoman said some of the attackers were wearing stiletto heels, and appeared to have been using them as weapons.

Alex White, 24, left the Wellington concert bloodied and battered and said she was too afraid to attend another gig.

White said a woman next to her had told her to stop pushing and after she replied that she could not help it she felt a blow to her head as seven women began to punch her.

She was yanked to the floor by her hair and said: ''Fists were flying, and you've just got so many fists to the head ... I got all dizzy, and blacked out for a few seconds.

"I thought I was going to end up at A&E in a coma, and not wake up."

Lynch could not believe the similarities between White's attack and her own and said the only difference was that she was able to get out before she was pulled to the floor.

The Christchurch student said she was going to stay away from mosh pits in the future.