COSRX Clear Fit Master Patch is a hydrocolloid type of patch that focus on treating partial skin troubles. Thinner and less visible than the Clear Master Fit Patch, these little pimple patches can be worn under makeup to make whiteheads, blackheads and picked zits disappear in a few hours. The ultra-thin clear hydrocolloid patch will stay on through showering and washing, it will draw out all the gunk in your pimple and protect them from outside bacteria.