Pimples pop up for a bunch of reasons. Unfortunately, there are a lot of myths about what these reasons are.
Despite what your friends might say, chocolate and french fries aren't among the causes of pimples. You just don't get pimples from what you eat.

Stress, though, can help get your hormones churning, and your hormones are one reason for your pimples. Maybe that's why it always seems like you break out when you stress-out.

Reasons why Pimple pop Up :
As you jump headfirst into puberty you know there are a lot of changes happening in your body. Well, you can thank your hormones for that. You can't stop them and, if you think about it, you really wouldn't want to in the long run anyway, would you?

As you grow toward adulthood, these hormones start getting all active. When that happens they start triggering a bunch of other things, including things under the surface of your skin.

Pimples start down in your pores. Down there are oil glands that produce this stuff called sebum. It's the oil you can feel on the surface of your skin.
Most of the time, the sebum escapes pretty much unnoticed through your pores, onto the surface of your skin.

Sometimes, though, something goes wrong with the way your dead skin cells are shed in the hair follicle. Instead of just escaping with the oil, they can team up with extra sebum stuff that your hormones have triggered. Together, they form a plug inside the pore.

More dead skin cells and sebum join in and it's like a big crowd, all pushing toward one blocked exit. Nobody's getting out.This gang can turn into what the scientists call a lesion. They come in two types: non-inflamed and inflamed.
The non-inflamed lesions don't have any redness to them.Now you may have heard about "blackheads" (in fact, you may have had them before). These non-inflamed lesions can stick out from your pores and are very noticeable. Some people think they're filled with dirt. But really, the content of the clogged pore can appear black as a result of dark pigment or oxidized oil, not because of dirt.

Some non-inflamed lesions look like little white bumps on your skin. These are called "whiteheads"-unlike "blackheads," you can't see the contents of the pores since they are closed to the surface.

What we all know as pimples are really inflamed lesions. It sounds kind of scary, but really it just means that there's been some redness and swelling.

This all happens because the bacteria that live in a healthy follicle can break down when the pore's been plugged. Little irritants found inside the pore get everything worked up and inflamed. That's what has happened when you wake up and see the pimple on your nose.

We have some homemade tips for preventing pimples :