Detectives are appealing for witnesses to a stabbing in Elephant & Castle Shopping Centre on Wednesday lunchtime.
He was being chased by a second black male who attacked him close to the WHSmith store and quickly left the scene via the same route.
The incident took place at about 1.35pm on Wednesday.
The suspect is described as a 30 to 40-year-old black man with a shaved head.
The victim suffered a stab wound to the neck which is not life-threatening.
Anyone who witnessed this incident should call Southwark CID on 020 7232 6188 or call Crimestoppers anonymously on 0800 555 111.