Masks can work on either side of the spectrum. That is to say it can be beneficial to both oily and dry skin types. This is so because there a re two different types of mask. Lets look at how diverse they are !!!
Wash off: Some exfoliate the skin by using micro-beads, which when rubbed again the skin surface remover dead skin reviling softer smoother skin. Others are recommended to stay on for a short time, allow to dry, followed by properly washing off after. This benefits oily skin as it helps absorbed excess sebum while unclogging pores.
Sheet: Super rich essences support skin’s moisture balance while delivering deep hydration. This nutrient rich mask mainly add to skin as a result changing skin to an even texture, in addition to a clear, glowing appearance.
What is a facial mask? https://en.wikipedia.org/wiki/Facial_mask