A.D.F. Hydrocolloid Dressing The uniquely developed hydrocolloid material effectively extracts impurities and creates a moist environment, which makes the healing process faster. Protecting the problematic areas The spot patch acts as a barrier against bacteria, preventing secondary infections. Intensive Acne Healing These masters of healing acne adhere strongly to the skin and work their magic overnight and throughout the day. Easy and Hygienic to Use COSRX Acne Pimple Master Patch comes in a resealable pouch with sterilized double packaging to keep it sanitary.