A 19-year-old man was found with a stab wound to his arm in South Croydon on Wednesday evening.
Police and paramedics were called to Wyche Grove at 7.40pm where the man was found. He was taken to a south London hospital and was discharged later that evening.
Officers from Croydon CID are investigating the incident and have made no arrests at this stage.
Anyone with information should contact police by calling 101.
