COSRX Acne Pimple Master Patch is a thin clear hydrocolloid patch that is effective in healing acne. It strongly sticks to the skin and absorbs gunk from whiteheads and popped zits, helping the acne flatten and reduce inflammation. The Original Pimple Patch: This 1st generation patch is loved by many over the years, due to its effectiveness. Highly raved in the media as well - a testimonial to its effectiveness.