COSRX Clear Fit Master Patch is an ultra-thin hydrocolloid acne patch with a matte, gradient finish that's nearly invisible on skin. Each pack contains 18 patches designed to effectively extract impurities while protecting blemishes from bacteria and secondary infection. Made with hydrocolloid material (Somadermspot-S), these patches create a moist environment to accelerate healing while being discreet enough for daytime wear. The patches can be worn under makeup for added invisibility. For best results, apply to clean, dry skin before other skincare products. Key ingredients include petroleum resin, cellulose gum, styrene isoprene styrene block copolymer, polyurethane film, polyisobutylene, liquid paraffin, and tetrakis methane.