simple past tense and past participle of mask
"The protesters wore masked faces to hide their identities from the cameras."
Wearing a mask or masks
"After the flu outbreak began, everyone on the train was masked to prevent the spread of germs."
The word comes from the noun "mask" with the suffix "-ed" added to form its past tense or passive participle. It retains the original meaning of having a mask worn or being covered by one.