Police are appealing for witnesses after a drunken woman reportedly threw a can of drink at two children.
The incident happened when a girl of 15 and her ten-year-old sister were walking in Normans Road, St Leonards.
They were approached by the woman, who threw the can at the teenager, hitting her on the head.
The contents were splashed over her and her sister.
A 36-year-old local woman has been arrested on suspicion of assault and bailed until July 13.
Anyone who saw the incident, which happened shortly after 10pm last Sunday, is asked to phone Sussex Police on 101 or email firstname.lastname@example.org.