The exact cause of acne in not known yet. It is considered as a result of many several factors coming together.
Those who are prone to acne often have skin that is oilier than average.
This oil than creates an impaction as it gets trapped withing the pores.
Skin attacked by acne also produces much more dead cells and the body is than not getting rid of them properly.
These dead cells than block the pores as they stick to the surface of the skin. When the pores become blocked, the bacterium that is present in the human skin pores grows unchecked.
One important factor is an increase in hormones called androgens (male sex hormones).
These increase in both boys and girls during puberty and cause the sebaceous glands to enlarge and make more sebum.
Another factors are related to pregnancy and stopping birth control pills because both make hormonal changes in womens body.
Heredity or genetics are another major elements in acne development.
Certain drugs, including androgens and lithium, are known to cause acne.
Greasy cosmetics may alter the cells of the follicles and make them stick together, producing a plug.
You can find tons of myths about acne causes all over the internet. These are the most wide-spreaded: