15-year-old Joshua Oakey was last seen around 1.15pm on April 11 in the Blackgate Lane area.
He is described as white, 5ft 2in tall, of slim build. He was wearing a black hoodie, black tracksuit bottoms and black Nike trainers at the time of his disappearance.
Joshua has links to the Preston area.
A Lancashire Police spokesman said: “Joshua has been missing for a number of days now and we are concerned for his welfare.
“We are urging anyone with information leading to his whereabouts to call us.”
If you can help, call police on 101 quoting log reference 1531 of April 11.