Blackheads are the slightly different sibling of zits, and like zits, squeezing them can be addictive. Composed of the same oil, or sebum, that contributes to the production of pimples, blackheads result from a building up of this oil in pores the difference in appearance is the result of the blackhead’s exposure to the air, the reaction of which with the oil causes the trademark black color of these blemishes. And while blackheads are more easily obscured by makeup, they can seem less offensive to the sufferer, and as a result, less damaging to squeeze. But squeezing is not good for blackhead. It leaves a permanent scar on skin and also infection will occur.