A man indecently exposed himself to a woman who was walking along a street in Long Eaton.
The victim was walking through a car park in Derby Road when a man started following her.
When the woman turned around, the man was exposing himself to her. The incident happened at about 8.40am on Wednesday January 1.
The offender was thought to be in his 20s and was white, about 5ft and of broad build.
He was wearing an orange jacket with the hood up, jeans and black shoes.
Witnesses or anyone with information relating to the incident should call Derbyshire police on 101 or Crimestoppers, anonymously, on 0800 555 111.