Sound like a crazy question? Turns out, it's not so crazy. If you've ever been a teenager (and I'll go out on a limb and say that most of you were), you're all too familiar with the following scenario: You start to notice a bump forming just above your lip. Or maybe it's on your chin. Or your nose. Then you start to feel a pus-filled whitehead forming and you can't wait to get to a mirror (let's hope at home) to pop that sucker. Chances are that you've popped a pimple or two in your day, but dermatologists say you should resist the urge. That's because popping pimplescan leave you with scars, or worse, an infection. When you pop a pimple, you're actually tearing open your skin in the process. You're also introducing bacteria from your hands into the open wound, which can become infected, leave a permanent scar, or make you very ill. In fact, there's something called "the triangle of death" on your face -- so called because getting an infection in this area can cause you to die. How so? Blood vessels in this area drain to the back of your head, at the base of your brain. This area also opens up to the sinuses. If not treated right away, an infection in your sinus cavity can be serious, leading to paralysis, loss of vision, or even death. That's a mighty good reason to keep your hands off those pimples, wouldn't you say? Also see: Skin and hair solutions in your fridge It's because these veins around the nose, mouth and eyes are so close to the brain that bacteria introduced to your face basically gives those bacteria free rein to wreak havoc. A cut on your finger wouldn't necessarily be as dangerous. Another thing to avoid? Pulling out your nose hairs. The nose is full of harmful bacteria that is trapped there by tiny hairs called cilia. They're there to prevent the bacteria from getting further into our body so, in a sense, a nose full of hair is actually your best line of defense against airborne infection. (Of course, if hairs start…