Acne is a skin condition that occurs when the oil-secreting glands in the skin are clogged and become inflamed or infected. Acne is caused by inflammation around the oil glands in the skin.
Hormones stimulate the oil glands to secrete more oil.
The skin pores become clogged and whiteheads and blackheads form. Bacteria grow in the clogged pores. When the body works to kill the bacteria, pimples form. These skin eruptions may be painful. Treatment is aimed at stopping the plugging of the pores and reducing inflammation.