What causes pimples is “Blocked Pores”!
Each Pore has a Hair Follicle, and all contain Sebaceous Glands (Oil Glands). 
Unfortunately, your Sebaceous Glands can become overactive and produce too much Sebum (oil) for your Skin, and can greatly increase the chances of causing your Pores to Become Blocked.
This can be the main reason and can be caused by your sexual hormones (called Androgen’s) and hormonal changes as your body goes through puberty.
This is why most of the population suffers from Pimples and Zits during their teenage years.
These glands Naturally Produce Oil which is called “Sebum”, the body produces this Oil to lubricate our Hair and Skin to help keep it Healthy.
Sebum is also produced to keep them looking Youthful, Protect your Skin and Hair and prevent them from Drying Out.
I know this seems Boring, and you may be wondering why you need to know this, but it is Important for you to understand the Acne Process and how to Beat It!
How and What Causes Pimples?
The Face has the most Oil Glands, then the Neck, your Chest, the Shoulders and your Back.
The Sebaceous Glands keep producing Sebum which builds up underneath a Blocked Pore and can become Infected and swell up. This can be due to many different factors.
Also, Your Skin is constantly regenerating and must shed Dead Skin Cells, these Dead Skin Cells can become stuck within the Sebum itself.
This can Block a Pore and Bacteria can also be trapped within all the Crap and cause Infection and Inflammation, which is the start of Pimples and Zits.
What Causes Pimples and Your Acne can be due to your Skins Process of shedding your Dead Skin Cells and is called “Sloughing”, how evenly and effectively this happens is not the same for everyone.
Most people will shed their skin evenly but uneven Sloughing can be a major contributing factor of Blocking Your Pores and causing Pimples and Zits.
There can be other reasons why your Body Produces too much Sebum, and there can be other contributing factors causing your Acne Problems.
But, it still comes down to the fact that, “What Causes Pimples” is Blocked Pores.
Treating Acne is not that hard, but you need to Start or nothing will happen and Your Acne will just get Worse!
* If Your Ready to Start an Acne Treatment, Check these Out Now; “Acne Treatments”