The exact cause of acne is unknown, several related factors are:

� Hormonal activity supposed to be responsible, such as menstrual cycles and puberty.

> Increase in hormones called androgens (male sex hormones), which causes sebaceous glands to enlarge and make more sebum.

> Hormonal changes related to pregnancy can also cause acne.

� Another factor is heredity or genetics. Researchers believe that the tendency to develop acne can be inherited from parents. For example, studies have shown that many school-age boys with acne have a family history of the disorder.

> Accumulation of dead skin cell.

> Bacteria in the pores, to which body becomes allergic.

> Skin irritation or scratching of any sort will active the inflammation.

> Starting or stopping birth control pills.

> Heredity (if your parents had acne, you might get it too).

> Some types of medicine.

> Greasy makeup.

In some patients, contributing factors may be:

Pressure: In some patients, pressure from helmets, chinstraps, collars, and the like can aggravate acne.