Acne is caused by excess oil secretion leading to blocked pores.
In adolescence, changing hormones can result in a change in oil production within the skin. It is more common during this stage of life.
Oil production is often localised in the face, chest, and back, which is why acne is most common in these areas.
Acne may take any of several forms, including blackheads and whiteheads, or pustules and papules.
The course of treatment may vary, depending on what type of acne is present on the skin.