Sussex Police are appealing for information following a series of indecent exposure incidents near Crawley.
A total of four incidents have been reported in the Tilgate Woods and Crawley Down area since March 2024.
Officers were called to an incident near Worth Way, Crawley Down on 18 March 2024.
Similar incidents were alerted to police in Tilgate Woods on 13 June 2024, 22 July 2024 and 24 July 2024.
They all took place between 7.30am and 10am.
The man has been described in all incidents as slim, white and wearing tights. In come cases, he has been wearing a mask.
Detective Constable Alicia Smith said: “We are aware that these incidents are concerning for the local community.
We have launched an investigation to identify the suspect and enquiries are ongoing to do so.
“If you have any information or footage or have seen anyone acting suspiciously in these areas, please contact police online or call 101 quoting Operation Marmion.”