Copacabana Rural Fire Brigade was called out on Tuesday morning, January 30, after bushland caught alight near the scout hall at Avoca Beach.
Firefighters arrived on scene and found a bushland area of about 20sqm alight.
It appeared that the fire was started from exploding deodorant cans and firefighters quickly extinguished it with a hose line.
Officers from Brisbane Water Police District are investigating the incident.
Shortly after attending the bushfire, the Copacabana Pumper then responded to Killcare to assist NSW Ambulance with an injured bushwalker on the Maitland Bay walking track.
The injured bushwalker was safely transported to an awaiting ambulance.
Killcare Wagstaffe Rural Fire Brigade and Fire and Rescue were also in attendance.