Police want to speak to three of four men involved in a fight on King Street.
A 23 year old was kicked and punched outside the USC shop between 1.10 and 1.20am on Sunday.
He suffered a bloodied nose and was treated by an ambulance crew but did not receive hospital treatment.
The other three men then walked off towards McDonalds.
Anyone who saw what happened should call police on 612612 or the independent charity Crimestoppers anonymously on 0800 555 111 or via their Anonymous Online Form at Crimestoppers-uk.org