Hero Mighty Invisible Patch 24 Hydrocolloid Patches are daytime patches that absorb pimple impurities in 6 to 8 hours, effectively concealing acne pimples discreetly. Their adhesive surface means they stay in place for perfect concealment and optimal peace of mind. Made from a hydrocolloid matrix that naturally absorbs exudate and impurities from acne pimples, and a breathable polyurethane film that protects the pimple from impurities, they are particularly effective on white pimples. They are not suitable for cystic acne or blackheads. dermatologically tested.