Police said they received a number of reports about a man indecently exposing himself in Rossendale over recent days.
Officers later confirmed a 74-year-old man from Bacup was subsequently arrested on suspicion of indecent exposure.
He remained in custody on Thursday morning (April 21).
“We are continuing to investigate other suspected offences,” a spokesman for Lancashire Police said.
Anyone with information can call 101 or email [email protected], quoting log 0893 of April 20.