Missing: Hui King-lam left his school group on a trip to the Mainland without notifying his teacher.

Police appeal for information on the whereabouts of a 15-year-old boy who went missing on a school trip to the Mainland on December 18.

Hui King-lam left the group without notifying his teacher. He was reported missing on December 22.

About 1.74-metres tall and has a mole on the right side of his neck, Hui is thinly built, has a pointed face, a fair complexion and short hair dyed in purple and red.

He was wearing glasses, a black top, a grey jacket and blue jeans when he went missing.

Anyone with information should contact Police on 2431 3686.