A man has been arrested following a string of indecent assaults in Melbourne's south-east during the past week.

Frankston Sexual Offences and Child Abuse Investigation Team detectives arrested a 21-year-old Langwarrin man over seven incidents in which a man approached female victims in shopping centre car parks and streets in Frankston and Langwarrin and asked for directions before indecently assaulting them.

Police are urging anyone with information relating to the assaults to contact Crime Stoppers on 1800 333 000, or visit crimestoppers.com.au.