Don’t squeeze, pick, pop, or poke at your pimples. You can do considerable damage to your skin, and cause scarring. When you squeeze a pimple, you put a lot of pressure on the follicle wall. If this wall breaks, infected material can spread beneath the skin. Skin tissue can be irreparably damaged. Even if pus drains from the pimple, damage can still be occuring below the skin’s surface where you can’t see.
Remember, that pimple is just temporary, but a scar can last forever. It’s not worth popping that zit. Besides, more often squeezing a pimple leaves it larger and redder than it was before. If it’s really bothering you, use a spot treatment on it instead.