A man had his fingertip and nail bitten off after a comment about his girlfriend sparked a brawl in Sydney’s CBD on Sunday morning.

The fight broke out between a group of men and a 23-year-old man just after midnight on Elizabeth Street, near Market Street.

The Rocks local area command duty officer, Inspector Kirsten Stocks, said the fight started after a comment was made about the 23-year-old’s girlfriend who was with him.

‘‘They didn't know each other. They simply crossed paths and some words were exchanged,’’ Inspector Stocks said.

During the fight, the 23-year-old man was allegedly bitten on his right middle finger and lost his fingertip and nail.