If you have stubborn pimple, leaving pimple marks, or just cystic acne that keeps on coming back. (I am not a Dermatologist, this is just a recommendation based on my use experience)
just a drop to affected area that you need to treat like black heads, before you prick.
Tea Tree Oil
Definitely works! hands-down
Hero Cosmetics Mighty Acne Pimple Patch Duo - 12ct
Quick dries your pimple wth the salycilic acid
Dry It Out Acne Gel Spot Treatment - Pacifica
an OTC Adapalene that kills stubborn pimples, even the cystic ones.
Differin
Peels off dark spots, and pimple marks. This also works not just for the face but for dark areas of your body.