A motorist has been arrested after allegedly stabbing another motorist during a fit of road rage in Sydney's east.

A 24-year-old man suffered stab wounds to his thigh and hand after the alleged road-rage incident in Mascot on Saturday afternoon.

A 58-year-old man handed himself into the police later that evening, where he was charged with grievous bodily harm to appear at Parramatta Local Court on Sunday.

AAP