A police spokesman said officers received a report of a robbery occurring at a Superdrug branch in Broadfield Barton, Crawley around 12.40pm on Sunday, January 27.
A man entered the store and took items from the shelves, threatened the staff and fled the premises, police said.
Police described the suspect as of large build and wearing a grey jacket with the hood up, dark blue jeans, dark coloured trainers with yellow soles and wearing a balaclava.
The spokesman said: "If anyone witnessed the robbery, noticed any suspicious behaviour or recognises the suspect from the description, please report online or call 101 quoting 561 of 27/01."