Protects wounded or troubled area from getting worse and maintains humidity of skin to prevent further breakouts. Hydrocolloid type. The uniquely developed hydrocolloid material effectively extracts impurities and creates moist environment, which makes the healing process faster. The spot patch acts as a barrier against bacteria, preventing secondary infection. These masters in healing acne adheres to the skin strongly and does the magic by extracting impurities and reducing redness. CosRX Acne Pimple Master Patch comes in a resealable pouch and sterlized double packaging to keep it sanitary.