You could also cause permanent dark marks to form on your skin.
In addition to light-colored scarring on the skin, popping your pimple might lead to something called post-inflammatory hyperpigmentation.According to the American Academy of Dermatology, this is when a dark patch develops on the sight of healed blemish. This process seems to affect darker skinned people more frequently and with greater severity, but it can happen to anyone. Lighter skinned people sometimes find that red patches develop rather than darker spots.