Face masks, Surgical masks or Covid masks were worn by humans to protect either their nose and mouth or their nose and eyes. During the COVID-19 pandemic, they became an invaluable means of preventing acquiring the virus and spreading it to others.
In 3000 Tokyo, the Tenth Doctor and Martha Jones, having escaped duelling bank robbery attempts by gangs of aliens, were trapped inside the vault of one of the gangs. When a poisonous gas was vented, the Doctor and Martha donned masks to prevent themselves from inhaling it. (COMIC: Operation Lock-up)
Bill Potts briefly took a fancy to a girl wearing a face mask, all that Bill could see of her face being her "beautiful" eyes. (WC: The Best of Days)
Hobo Kostinen wore a face mask with a shark face design. (PROSE: 8.46) The Eighth Doctor created masks with similarly quirky designs, offering each of the residents of 107 Baker Street a mask featuring a picture of their face. Helen Sinclair declined, as did Robin Bright-Thompson, who was not fond of the recursiveness of the concept. (AUDIO: Best Year Ever)
In 2023, Dodo Chaplet noticed people in London wearing face masks, which the First Doctor told her was as a result of the pandemic. (AUDIO: The Demon Song)