A face mask is a treatment spread on the face and left to work. Put on a face mask.
Clay ones draw out oil and cream ones put moisture back, which are opposite jobs. A face mask left on too long dries the skin rather than helping it.
1nounface maskA treatment spread on the face and left to work.
“The face mask set hard and had to be soaked off.”
face mask is a treatment.
Practised in Beauty & Cosmetics