Complexion Extractor with Lance
The Sephora Complexion Extractor with Lance has a stainless steel lancet for piercing whiteheads and a ring for pressing out blackheads.

To use: Prior to using the Complexion Extractor with Lance, steaming the face, or using a hot water compress is strongly recommended to help soften comedones. This will make them much easier to remove.
When you're ready to begin the extraction process lay the looped side on top of the blackhead - basically encircling this area with the loop. Apply slow and even pressure lightly until the trapped sebum is forced out of the follicle. Do not continue to attempt the extraction if the trapped sebum is not released easily. Applying too much force can cause infection and scarring.
When piercing a whitehead, wait until the whitehead breaks open, then gently roll the tool over the whitehead. Be sure to disinfect the area when finished and clean your tool off with alcohol or hot water.

A deep, cystic pimple should not be opened with the lancet. When dealing with deep acne, it's best to visit a dermatologist. A doctor may use a sterile needle, but only after a pustule has formed. Additional treatments depend on the severity of the acne.