A teenager was hospitalised after he was stabbed in Peckham Park Road last week.
The police were called at around 9.30pm on Thursday April 23 to reports of a fight near the junction with Old Kent Road.
Officers and London Ambulance Service attended and found a man, aged eighteen, suffering stab injuries.
He was taken to a south London hospital where he was said to be in a stable condition and his injuries were not believed to be life-threatening.
Officers from Southwark are investigating but no arrests have yet been made.
Anyone with information is asked to call Southwark CID on 101 or Crimestoppers anonymously on 0800 555 111.