These are just hydrocolloid bandages which can draw moisture out of a pimple. Pointless on below-surface pimples unless you want to stop yourself picking. But if any oil (or gunk, but works best on oily ones for me) comes out of a pimple when you squeeze it, put one of these on and they'll drain it flat and it will heal soo quickly compared to if you squeezed it yourself. They also stick really well, only had 1 come off after staying on for hours, and I've used dozens.