I highly recommend the Needle Trouble Patches; I always stock up on them whenever Olive Young has a sale.

The needle acne patches are the one thing I always add to my cart whenever Olive Young has a sale. When a pimple is about to flare up and turns red, instead of using a regular patch, I stick on that one with the sharp, needle-like things and press down firmly. The next day, it literally goes right back in like magic! It works wonders on hard, unsqueezable pimples, so I plan to keep using these for the rest of my life.