Three men on mopeds brandishing knives and a metal pole left their victim with cuts and bruises after a nasty and unprovoked attack.
The victim was attacked by three white youths on mopeds at about 11pm on Sunday, April 16, in Haydons Road, Wimbledon.
He shared images of his injuries with Merton Police to help with the identification of the attackers.
The Metropolitan Police is investigating, and has shared CCTV images of the suspects as part of its appeal.
To offer information, call the force on 101 quoting crime reference number 1404466/17.
To offer information anonymously, call the independent charity Crimestoppers on 0800 555 111.