The collision took place at Race Hill near the Tesco superstore at 3.45pm and involved a young boy on a skateboard and a blue five series BMW car. The boy, aged 14, was taken by air ambulance to Derriford for treatment for head injuries, which were later described as minor.
Police are keen to hear from anyone who saw the collision or either the teenager or car shortly before the incident. Police are particularly keen to hear from a woman who was driving a burgundy car and stopped at the scene.
Anyone with information is asked to call police on 101 quoting reference 517 30th March 2012.