I always buy them in balk. It works great on white heads and does kinda less for the ones under the skin. 

This is the best discovery ever, you just put it on your pimple and wake up the next day with all the gunk sucked out onto the patch its gross but satisfying to see that the product works! 

helps reduce redness and size of acne however white dot (puss) will remain if pimple patch not in use