Sydney teen stabbed in back during brawl

A teenager has been stabbed in the back during a brawl in Sydney's south.

Police responding to reports of a fight on Monday night found the wounded 15-year-old on a residential street at Bexley.

Paramedics treated the teenager at the scene before taking him to St George Hospital, police said.

A 16-year-old boy was arrested on Tuesday at the same hospital while seeking treatment for a cut to his hand.

He was charged with malicious wounding and is due before Sutherland Children's Court on Tuesday.