A 29-year-old man was attacked while he was out drinking on Friday night.
Police say a fork might have been used in the assault at 11.50pm in Kenilworth Road, St Leonards.
A 24-year-old man from Beckenham, Kent, was arrested on suspicion of affray and bailed until September 23.
Anyone who witnessed the incident is asked to call 101 or email firstname.lastname@example.org quoting serial 1725 of 2/8.
Or call Crimestoppers anonymously on 0800 555 111.